AU2013343638A1

AU2013343638A1 - Formulation for bispecific T-cell engagers (BITES)

Info

Publication number: AU2013343638A1
Application number: AU2013343638A
Authority: AU
Inventors: Thomas Bunte; Carsten Olbrich; Jorg Peters; Thomas Trill; Jonas WINTER
Original assignee: Bayer Pharma AG
Current assignee: Amgen Inc
Priority date: 2012-11-06
Filing date: 2013-11-05
Publication date: 2015-05-28
Anticipated expiration: 2033-11-05
Also published as: HUE038151T2; US20150335706A1; US11052128B2; CY1120391T1; CN104780940B; TW201438764A; TR201809507T4; PT2916866T; HRP20181021T1; HK1211215A1; ES2676468T3; NZ707895A; PL2916866T3; DK2916866T3; IL238615A0; AU2018214096A1; MX2015005700A; SI2916866T1; WO2014072277A1; JP6321667B2

Abstract

The present invention relates to stable pharmaceutical compositions which contain polypeptides having at least two antigen binding domains and are particularly suitable for subcutaneous administration. The invention provides liquid compositions which minimize the formation of unwanted polypeptide aggregates (dimers and/or multimers). The present invention further provides a method of minimizing the aggregation of polypeptides having antigen binding domains in liquid compositions.

Description

~ 1 Formulation for bispecific T-cell engagers (BITES) Introduction The present invention relates to stable pharmaceutical compositions which contain polypeptides having at least two antigen-binding domains and are especially suited for subcutaneous 5 administration. The invention provides liquid compositions which minimize the formation of undesired polypeptide aggregates (dimers and/or multimers). The present invention further provides a method for minimizing the aggregation of polypeptides having antigen-binding domains in liquid compositions. Prior art 10 The need to stabilize antibodies in solution, i.e. to prevent the formation of dimers and multimers (known as High Molecular Weight or HMW aggregates), in order to keep the therapeutic efficacy constant is known in the prior art. W02011061712 discloses stabilized antibody formulations which, in addition to 25 - 250 mg/ml antibody, contain 10-30 mM of a buffer (preferably acetate, succinate, phosphate, histidine or combinations thereof), 1-15% of a polyol and also 0.001-0.05% 15 of a wetting agent. The pH of the compositions is between 5-7.5. W02010148337(Al) ("Lyophilized formulation for small modular immunopharmaceuticals") discloses compositions of what are known as Small Immunopharmaceutical Proteins (SMIP). These are constructs composed of multiple fused domains, for example an antigen-binding domain, an immunoglobulin hinge region and a C42 or CH3 region of an Ig molecule or a region derived 20 therefrom. The domains of the SMIPs consist of polypeptides which are products of gene sequences which may be of human, non-human or artificial (generated using gene-technology methods) origin. Although SMIP proteins are preferably monospecific, the application also discloses multispecific variants, for example Scorpion molecules. They contain SMIP proteins having a further C-terminal binding domain. The binding domains of the Scorpion molecules bind 25 preferably to different target structures and are therefore suitable as immunospecific therapeutics. W02010148337(Al) discloses stable formulations of lyophilized compositions containing an SMIP, with less than 7% of the SMIP being present in aggregated form. Said formulations can further comprise buffer agents, stabilizers, bulking agents, wetting agents and further excipients. W02009070642 Al discloses various fonnulations of the BiTE molecule MT1 03, the first binding 30 domain of which binds specifically to the T-cell receptor antigen CD3, whereas the second binds specifically to the B-cell antigen CD19. The BiTE molecules are stable in the disclosed compositions up to a maximum concentration of 300 pg/ml, at a pH of 7.0. The buffer used is citrate. The formulations are suited for intravenous and subcutaneous administration. The bioavailability after subcutaneous administration is 10-50%.

-2 IgG antibodies have large constant regions (CHI.3/CL regions), which are responsible for the majority of their physicochemical properties. IgG antibodies having varying specificity differ structurally mainly in the region of the hypervariable antibody binding sites (CDR1-CDR3) within the VL and Vu regions. The structural and physicochemical differences between the individual IgG 5 variants are relatively small owing to the large constant regions. Like IgG antibodies, the SMIP molecules described in W02010148337 (Al) contain parts of the constant antibody domain. By contrast, BiTE molecules having varying specificity differ markedly in their physicochemical properties. As fusion protein composed of two single-chain variable fragments (scFv) of, in general, different immunoglobulins, they lack the constant CH1-3/CL regions, and so differences in 10 the antigen-binding domains concern much larger sections of the BiTE molecules than is the case for IgG or SMIP antibodies. Likewise, the BiTE molecule MT103 and the BiTE molecules which are used in the present invention differ principally in their molecular structure. Whereas the domains in MT103 are arranged in the sequence VL-VH-VH-VL, the arrangement for BiTE molecules which are preferably used in the present invention is of the form VH-VL-VI]-VL present. 15 Furthermore, the sequences of both molecules differ at numerous positions. These properties of the BiTE molecules and their small size give rise to distinct differences in the physicochemical behaviour of different BiTE molecules. This results in the need to develop individual formulations (to increase the physicochemnical stabilities) for each individual application, since the formulations of individual BiTEs or similar molecules cannot be used, or can only be 20 used with restrictions, for alternative applications. In one embodiment, the polypeptides present in the compositions are what are known as Bispecific T-cell engangers (BiTEs). In a specific embodiment, BiTEs have a first binding domain which binds specifically to the s chain of the T-cell receptor-CD3 complex and a second binding domain which binds specifically to prostate-specific membrane antigen (PSMA). PSMA is an integral type 25 II membrane protein which is expressed on prostate epithelial cells with high specificity and, in the event of prostate cancer, at increased intensity. Furthermore, PSMA is expressed by newly formed blood vessels of solid tumours. PSMA-BiTEs thus mediate direct contact between cytotoxic T cells and these target cells. Aggregate formation in proteins, for example BiTE molecules, is undesirable in pharmaceutical 30 applications, for example the efficacy or availability of a biological active ingredient can be altered by aggregate fornation. This results in the object of providing a fonnulation which allows BiTE molecules to be stabilized in such a way that undesired aggregate formation is suppressed.

-3 The solution is set forth in the present application and in the claims and encompasses a BiTE formulation comprising TRIS and phosphate. In its preferred embodiment, the fornmulation comprises 50 mM phosphate, 100 mM TRIS, 0.04% polysorbate 80 and 4% trehalose dihydrate at a pH of 6.0 and is capable of stabilizing formulations with PSMA-BiTEl molecules with respect to 5 the formation of aggregates. This applies both to low concentrations in the range of below gg/ml and to high concentrations of >2 mg/ml. The stabilizing effect is surprising for a person skilled in the art, since, for example, the citrate used in W02009070642 Al, even as a combination of 50 mM citrate and 100 mM TRIS at pH 6.0, does not exhibit this effect. For instance, the measured dimer fraction in a comparable composition which contained only citrate instead of phosphate was 10 7.0%. By contrast, the composition according to the invention limited the dimer fraction to 0.8% (cf. tables 6 and 7). The combined use of TRIS and phosphate is responsible for the stabilizing effect of the compositions. To stabilize the BiTE molecules with respect to shear forces as well, a wetting agent such as polysorbate 80 in a concentration of at least 0.04% is required, since the dimer fraction will otherwise be too large (approx. 7.5%, see table 15). To prevent the adsorption 15 of the PSMA-BiTEJ molecules on the vessel wall of injection syringes, infusion bags, etc., it is sufficient to have just 0.002% polysorbate 80. Definitions The term "antibody" used herein refers to immunoglobulin molecules which each comprise two heavy (H) and two light (L) polypeptide chains which are connected to one another via disulphide 20 bonds. Each heavy chain consists of a variable region (V 11 ) and a constant region, which in turn consists of three domains (Cl, C, 1 2 and CH3). Each of the light chains is composed of a variable region (VL) and a constant region (CL). The variable regions of both the light and the heavy chains (Vi and VL) are further subdivided into, in each case, three hypervariable antibody binding sites (CDR1-CDR3) and altogether four conserved regions between the CDRs (FR1-FR4). 25 The term "monoclonal antibody" describes an antibody which originates from a population of antibodies which are identical with the exception of relatively small, naturally occurring mutations or post-translational modifications. In contrast to polyclonal antibodies, as appear as part of the immune response, monoclonal antibodies are directed against a specific epitope. A "bispecific" or "bifunctional antibody" is an artificial, hybrid antibody having two different pairs 30 of heavy and light chain and also two different antigen-binding sites. Treatment of antibodies with papain leads to two identical, antigen-binding Fab fragments and to the crystallizable Fc fragment. A "Fab fragment" consists of a complete VL chain and part of the heavy chain, viz, the V 1

.

1 domain containing the variable region and the first constant domain C 1

.

1 1. Each Fab fragment thus has an individual antigen-binding site. The "Fe fragment" comprises the -4 carboxy-terminal parts of both heavy chains, linked via disulphide bonds. Parts of the Fe fragment are recognized by Fc receptors of other cells and determine via this the effector functions of the antibodies. Pepsin cleaves antibodies below the disulphide bonds, and so the two Fab fragments remain 5 connected via the hinge region and a single "F(ab') 2 fragment" is formed. It has both antigen binding sites and is therefore capable, like the complete antibody, of cross-linking antigens. The term "domain" describes a globular region of a protein having a defined and independently folded structure. The light chains of an IgG antibody are composed of two domains (in each case, a constant and a variable domain); the heavy chains are composed of four domains (in each case, 10 three constant and one variable domain). The two variable regions are each composed of one domain of the heavy chain and one domain of the light chain. The tenn "epitope" or "antigenic determinant" describes the area of an antigen to which an antibody (or the antigen-binding fragment thereof) specifically binds. Epitopes can consist of successive amino acids, or of non-successive amino acids which are in close proximity to one 15 another as a result of tertiary protein folding. An "antigen" is a molecule (e.g. a protein, polypeptide, peptide, carbohydrate) having an "antigenic determinant" to which an antibody can bind. The term "confonnation" refers to the tertiary structure of a protein or polypeptide, for example an antibody, an antibody chain, a domain or a part thereof. 20 An antibody which "specifically binds" a particular polypeptide or an epitope on a particular polypeptide, or is "specific for" this structure, binds to alternative structures considerably less effectively. The term "scFv antibody" in this application refers to artificially produced antibody fragments consisting of covalently bonded VH and VL domains of an antibody. Both domains are present in a 25 single polypeptide chain and are connected to one another via a polypeptide linker composed of multiple amino acids. With the exception of the Fe-mediated effector functions, scFv antibodies retain all functions of an antibody, more particularly its selectivity and affinity. "Bispecific T-cell enganger" (BiTE) molecules are recombinant protein constructs composed of two flexibly connected single-chain antibodies (scFv). One of said scFv antibodies binds 30 specifically to a selected, target cell-expressed tumour antigen, the second binds specifically to CD3, a subunit of the T-cell receptor complex on T cells. The BiTE antibodies are capable of binding T cells transiently to target cells and, at the same time, activating the cytolytic activity of -5 the T cells. The BiTE-mediated activation of the T cells requires neither specific T-cell receptors on the T cells, nor MHC I molecules, peptide antigens or co-stimulatory molecules on the target cell. The terms "stability" and "stable" in the context of BiTE molecule-containing compounds describe 5 the resistance of the antibodies or their fragments with respect to aggregation, degradation or fragmentation under the given conditions relating to their production, preparation, storage, use or transport. "Stable" formulations according to the present invention retain their biological activity under the given production, preparation, transport, use and storage conditions. Proteins present in solution (e.g. BiTE molecules) are sensitive to mechanical movement, as occurs 10 during production, container-filling and transport. Above a certain intensity of movement, the molecules aggregate and/or denature. Liquid, protein-containing compositions are thus exposed to what is known as agitation stress during mechanical movement. In an "agitation stress test", the controlled use of mechanical (agitation) forces on liquid, protein-containing compositions is used to analyse the aggregation and denaturation behaviour of the dissolved protein in different 15 compositions. The behaviour of a protein in the agitation stress test is an indication of its physical stability with respect to shear forces, as occur, for example, during aspiration and injection of solutions with cannulac or. "Lyophilization" describes a drying method which is based on the principle of sublimation. The 20 substance to be dried is firstly cooled down to about -45 0 C before a vacuum is subsequently applied and the substance is heated to about -20*C. As a result, the ice crystals sublime directly into the gaseous state without passage through a liquid intermediate step. The substance dried in this manner contains, after a secondary drying step (still under vacuum) at about 25*C, less than 5% of its original moisture and is referred to as a "lyophilisate". 25 Prior to administration to the patient, the lyophilisate is "reconstituted", i.e. dissolved in a phannaceutically acceptable diluent. A "reconstituted fonnulation" in the context of the present invention is formed by dissolving a lyophilized antibody formulation in such a diluent. The antibody is subsequently in dissolved forn and can be administered to the patient. "Polyols" describe a group of organic compounds which contain multiple hydroxyl groups (-OH) 30 (polyalcohol, polyhydric alcohol). Polyols such as sucrose or trehalose are sugars which are capable of stabilizing antibodies and/or influencing the osmolarity of a composition. To prevent undesired degradation or aggregation of proteins during lyophilization, so-called "lyoprotectants" are added. These are, for example, sugars or sugar alcohols such as sucrose, -6 mannose, trehalose, glucose, sorbitol, mannitol. In the context of the present invention, trehalose is the lyoprotectant which is preferably used. The term "wetting agent" herein refers to any detergent having a hydrophilic and a hydrophobic region and includes non-ionic, cationic, anionic and zwitterionic detergents. Usable detergents 5 encompass, for example, polyoxyethylene sorbitan monooleate (also known as polysorbate 80 or TWEEN 80), polyoxyethylene sorbitan monolaurate (also known as polysorbate 20 or TWEEN 20), or N-laurylsarcosine. For the compositions disclosed herein, preference is given to a non-ionic wetting agent. Particular preference is given to the use of polysorbate 80 for the compositions of the present invention. The wetting agent can be used in a concentration of from 0.002% to 0.1%. 10 The term "buffer" describes herein a buffered solution, the pH of which changes only slightly after addition of acidic or alkaline substances. Buffered solutions contain a mixture of a weak acid and its corresponding base or of a weak base and its corresponding acid. The term "patient" refers to human or animal) individuals receiving a preventive or therapeutic treatment. 15 The tenn "treatment" herein refers to the use or administration of a therapeutic substance on/to a patient, or to the use or administration of a therapeutic substance on/to an isolated tissue or on/to a cell line of a patient, who is suffering from a disease, is showing a symptom of a disease, or has a predisposition to a disease, with the goal of curing, improving, influencing, stopping or alleviating the disease, its symptoms or the predisposition to the disease. 20 "Effective dose" describes herein the active-ingredient amount with which the desired effect can be at least partially achieved. A "therapeutically effective dose" is therefore defined as the active ingredient amount which is sufficient to at least partially cure a disease, or to at least partially eliminate adverse effects in the patient that are caused by the disease. The amounts actually required for this purpose are dependent on the severity of the disease and on the general immune 25 status of the patient. The tenn "bioavailability", as used here, describes the percentage of an active ingredient or of a medicinal-product dose which is available unaltered in the systemic circulation. Bioavailability is thus a measured value indicating how rapidly and to what extent the active ingredient is absorbed and available at the site of action. By definition, intravenously administered medicinal products 30 have a bioavailability of 100%. Absolute bioavailability describes the bioavailability of a substance administered in any desired (non-intravenous) manner compared to intravenous administration, whereas relative bioavailability -7 results from a comparison of the bioavailabilities for particular dosage forms (e.g. oral vs. subcutaneous). An "isotonic compound" has substantially the same osmotic pressure as human blood. Isotonic compounds therefore have in general an osmotic pressure of about 250 to 350 mOsm. The term 5 "hypotonic" describes compositions having an osmotic pressure below that of human blood, whereas "hypertonic" compositions have an osmotic pressure above that of human blood. The term "high-molecular-weight aggregates" (synonym: "HMW") describes aggregates which are composed of at least two protein monomers. The term "phosphates" used herein refers to water-soluble, pharmacologically safe salts of the 10 tribasic orthophosphoric acid (11 3 P04), with preference being given to primary (hydrogen-) and secondary (dihydrogen-) phosphates. The compositions according to the invention contain preferably sodium phosphates, particularly preferably disodium hydrogenphosphate (Na 2 HP04). Detailed description The invention relates to the pharmaceutical formulation of a bispecific T-cell engager (BiTE) 15 molecule, characterized in that it comprises tris(hydroxymethyl)aminomethane (TRIS) and phosphate. BiTE molecules are known in the prior art. BiTE molecules are designed in such a way that they transiently enlist cytotoxic T cells for the lysis of particular target cells (see Bauerle et al. Curr Opin Mol Ther. 2009 Feb;1 l(l):22-30.). They are especially suitable for cancer therapy. 20 A BiTE molecule is a polypeptide which comprises two scFv antibody binding domains, with the first scFv binding domain being able to bind to human CD3 epsilon and the second scFv binding domain binding a second, further surface antigen. Preference is given to human surface antigens of cancer cells. Particularly preferred surface antigens are human surface proteins of cancer cells. The scFv binding domains can comprise chimeric, humanized or human antibody fragments. 25 Preferably, the scFv binding domains comprise human or humanized antibody fragments. The BiTE molecules used in the present invention differ from the BiTE molecules (e.g. MT103) as described, for example, in W02009070642 Al in that the first binding domain can bind to an epitope of the human and Callithrix jacchus, Saguinus oedipus or Saimiri sciureus CD3 epsilon chain, with the epitope being part of an amino acid sequence selected from the group consisting of 30 SEQ ID NO: 1, 2, 3 and 4 and the epitope comprising at least the amino acid sequence Gln-Asp Gly-Asn-Glu. This has the advantage that preclinical investigations are facilitated, since, for example, pharmacokinetic or toxicological studies can be carried out in the aforementioned test -8 animals, whose immune system is similar to that of humans. BiTE molecules having these characteristics are disclosed in, for example, in W02008119566 A2 or W02008119567 A2. In one embodiment, the composition according to the invention thus comprises BiTE molecules, the first binding domain of which can bind to an epitope of the human and Callithrix jacchus, 5 Saguinus oedipus or Saimiri sciureus CD3 epsilon chain, with the epitope being part of an amino acid sequence selected from the group consisting of SEQ ID NO: 1, 2, 3 and 4 and the epitope comprising at least the amino acid sequence GIn-Asp-Gly-Asn-Glu. SEQ ID NO: 5 displays the amino acid sequence of an scFV binding domain which meets the above criteria. 10 In a preferred embodiment, the first binding domain of the polypeptide comprises the amino acid sequence reproduced in SEQ ID NO: 5. scFV comprises the amino acids of a variable light (VL) and a variable heavy (VH) antibody chain. BITE molecules can be constructed in varying orientation. The BiTE molecule MT103 has, for example, a (VL-VH) binding domain 2 - (VH-VL) binding domain 1 arrangement of the scFVs. 15 Other orientations are also possible, for example (VH-VL) binding domain 2 - (VH-VL) binding domain 1. In a preferred embodiment, the polypeptide has the arrangement (VH-VL) binding domain 2 (VH-VL) binding domain . In a particularly preferred embodiment, the polypeptide has the arrangement (VH-VL) binding 20 domain 2 - (VH-VL) binding domain 1, with (VH-VL) binding domain 1 comprising the amino acid sequence reproduced in SEQ ID NO: 5. One embodiment of the present invention is a liquid pharmaceutical composition, characterized in that the second binding domain can bind to a cell surface antigen. A cell surface antigen is an antigen which can be bound by a binding protein, for example an antibody or an scFv, without the 25 cell having to be lysed. One embodiment of the present invention is a liquid pharmaceutical composition, characterized in that the second binding domain of the polypeptide can bind to a surface antigen of a cancer cell. In a further embodiment, the second binding domain of the polypeptide binds to the human surface antigen prostate-specific membrane antigen (PSMA, SWISS-PROT: FOLH1_HUMAN, accession 30 no: Q04609). Such BiTE molecules are described, for example, in W02010037836 A2.

-9 SEQ ID NO: 6 describes a binding domain which binds to PSMA. In a preferred embodiment, the second binding domain of the polypeptide comprises the amino acid sequence reproduced in SEQ ID NO: 6. One embodiment of the present invention is a liquid phannaceutical composition comprising a 5 polypeptide which comprises a first and a second scFv binding domain, with the first binding domain comprising the amino acid sequence reproduced in SEQ ID NO: 5, characterized in that the composition further comprises TRIS and phosphate. One embodiment of the present invention is a liquid pharmaceutical composition, characterized in that the binding domains of the polypeptide comprise human or humanized scFv antibody 10 fragments. One embodiment of the present invention is a liquid phannaceutical composition, characterized in that the second PSMA-binding binding domain comprises the amino acid sequence reproduced in SEQ ID NO: 6. In one embodiment, the polypeptide comprises the amino acid sequences of the first and second 15 binding domain encoded by the sequences reproduced in SEQ ID NO: 5 and SEQ ID NO: 6. A polypeptide which comprises the sequences reproduced in SEQ ID NO: 5 and SEQ ID NO: 6 is reproduced in SEQ ID NO: 7 or SEQ ID NO: 8. A preferred polypeptide comprises the amino acid sequence reproduced in SEQ ID NO: 7. A particularly preferred polypeptide is the PSMA-BiTE 1 molecule, which is encoded by amino 20 acid sequence reproduced in SEQ ID NO: 8. A preferred embodiment of the present invention is a liquid pharmaceutical composition comprising a polypeptide, TRIS and phosphate, with the polypeptide comprising the amino acid sequence reproduced in SEQ ID NO: 7. A particularly preferred embodiment of the present invention is a liquid phannaceutical 25 composition comprising a polypeptide, TRIS and phosphate, with the polypeptide comprising the amino acid sequence reproduced in SEQ ID NO: 8. In one embodiment, the composition according to the invention comprises about 0.5 pg/ml, about 0.7 pg/ml, about 1 pg/ml, about 2 pg/ml, about 5 pg/ml, about 6 pg/ml, about 10 pg/ml, about 15 pg/nil, about 18 pg/ml, about 20 pg/ml, about 25 pg/ml, about 30 pg/ml, about 30 pg/ml, about 35 30 pg/ml, about 40 pg/ml, about 45 pg/ml, about 50 pg/ml, about 55 pg/ml, about 60 pg/ml, about 70 -10 pg/ml, about 80 ig/mil, about 90 pg/ml, about 100 jig/ml, about 110 pig/ml, about 120 jig/ml, about 130 jig/ml, about 140 pig/ml, about 150 Rg/ml, about 160 jig/ml, about 170 jg/ml, about 180 Ag/ml, about 190 jig/ml, about 200 jig/ml, about 225 jg/ml, about 275 jig/ml, about 300 jg/ml, about 325 pg/ml, about 350 jig/ml, about 375 jg/ml, about 400 pg/ml, about 500 pg/ml, about 700 5 pg/ml, about 900 jig/ml, or about 1000 jig/ml of the above-mentioned polypeptides. In one embodiment, the composition according to the invention comprises 0.5 pg/ml, 0.7 pg/ml, 1 jig/ml, 2 jg/ml, 5 jg/ml, 6 jig/ml, 10 pg/ml, 15 jig/ml, 18 jig/ml, 20 pg/ml, 25 pg/ml, 30 jig/ml, 30 pg/mi, 35 jig/ml, 40 pg/ml, 45 jig/ml, 50 jig/ml, 55 jig/ml, 60 jg/ml, 70 pg/ml, 80 jig/ml, 90 jg/ml, 100 jig/ml, 110 jg/ml, 120 jig/ml, 130 pig/ml, 140 jig/ml, 150 jig/ml, 160 jg/ml, 170 pg/mil, 10 180 jig/ml, 190 pg/mil, 200 pg/ml, 225 jig/ml, 275 pg/ml, 300 pg/ml, 325 pg/ml, 350 pg/ml, 375 jig/ml, 400 jig/ml, 500 jg/ml, 700 jg/mil, 900 jig/ml, or 1000 jig/ml of the BiTE molecules. In a further embodiment, the composition according to the invention comprises about 1 mg/ml, about 1.3 mg/ml, about 1.5 mg/ml, about 1.8 mg/ml, about 2 mg/ml, about 2.3 mg/mi, about 2.5 mg/ml, about 2.8 mg/ml, about 3 mg/ml, about 3.5 mg/ml, about 4 mg/ml, about 5 mg/ml, about 6 15 mg/ml, about 7 mg/ml, about 8 mg/ml about 9 mg/ml or about 10 mg/ml of the BiTE molecules. In a further embodiment, the composition according to the invention comprises about I mg/ml, 1.3 mg/ml, 1.5 mg/ml, 1.8 mg/ml, 2 mg/ml, 2.3 mg/ml, 2.5 mg/ml, 2.8 mg/ml, 3 mg/ml, 3.5 mg/ml, 4 mg/ml, 5 mg/ml, 6 mg/ml, 7 mg/mI, 8 mg/ml 9 mg/nil or 10 mg/ml of the BiTE molecules. In a further embodiment, the composition according to the invention comprises from about 0.5 20 jig/ml to about 1 jig/ml, from about 1 jig/ml to about 5 jig/ml, from about 5 sg/ml to about 10 jig/nl, from about 10 jig/ml to about 20 jig/ml, from about 20 jig/ml to about 50 pg/ml, from about 50 pig/ml to about 90 jig/ml, from about 90 jig/ml to about 120 jig/ml, from about 120 jig/ml to about 150 jig/ml, from about 150 jig/ml to about 180 sg/ml, from about 180 jig/ml to about 200 jig/ml, from about 200 jig/ml to about 250 pg/ml, from about 250 pg/ml to about 280 jig/ml, from 25 about 280 jig/ml to about 300 jg/ml, or from about 300 pg/ml to about 350 jig/ml of the BiTE molecules. In a further embodiment, the composition according to the invention comprises from 0.5 pg/ml to I jig/ml, from 1 jg/ml to 5 jig/ml, from 5 jig/ml to 10 jig/ml, from 10 jig/ml to 20 jg/ml, from 20 jig/ml to 50 jig/nl, from 50 jg/ml to 90 pg/ml, from 90 jig/ml to 120 jig/ml, from 120 jig/ml to 30 150 jg/ml, from 150 jig/ml to 180 jg/ml, from 180 jig/ml to 200 jig/ml, from 200 pg/ml to 250 jig/ml, from 250 jig/ml to 280 jig/ml, from 280 jig/ml to 300 ig/nl, or from 300 jig/ml to 350 g/in] of the BiTE molecules. In a further embodiment, the composition according to the invention comprises from about 350 jig/ml to about 1 mg/ml, from about 350 jig/ml to about 1.3 mg/ml, from about 350 jig/ml to about - 11 1.5 mg/ml, from about 350 jg/ml to about 1.8 mg/ml, from about 350 jg/mI to about 2 mg/nl, from about 350 pg/mi to about 2.3 mg/ml, from about 350 pig/ml to about 2.5 mg/ml, from about 350 [tg/ml to about 2.8 mg/ml, from about 350 ptg/ml to about 3.0 mg/ml, from about 350 jig/ml to about 3.5 mg/ml, from about 350 jig/ml to about 5 mg/ml, or from about 350 jig/ml to about 10 5 mg/mi of the BiTE molecules. In a further embodiment, the composition according to the invention comprises from 350 pig/ml to I mg/mi, from 350 jig/ml to 1.3 mg/mi, from 350 jig/ml to 1.5 mg/ml, from 350 jig/ml to 1.8 mg/ml, from 350 jig/ml to 2 mg/ml, from 350 pig/ml to 2.3 mg/ml, from 350 jig/ml to 2.5 mg/mI, from 350 jig/ml to 2.8 mg/ml, from 350 pg/ml to 3.0 mg/ml, from 350 pg/ml to 3.5 mg/ml, from 10 350 jig/ml to 5 mg/ml, or from 350 jig/ml to 10 mg/ml of the BiTE molecules. In a further embodiment, the composition according to the invention comprises from 0.5 jg/ml to 10 mg/ml, from 0.5 jig/ml to 5 mg/ml, from 0.5 jig/ml to 3.5 mg/ml, from 0.5 pg/ml to 3.0 mg/ml, from 0.5 pg/ml to 2.8 mg/ml, from 0.5 jg/ml to 2.5 mg/ml, from 0.5 pg/ml to 2.3 mg/mi, from 0.5 pg/ml to 2.0 mg/ml, from 0.5 pg/ml to 1.8 mg/ml, from 0.5 jig/ml to 1.5 mg/ml, from 0.5 pg/ml to 15 1.3 mg/ml, from 0.5 jg/ml to 1.0 mg/ml, from 0.5 jig/ml to 350 jig/ml, from 0.5 jg/ml to 300 jig/ml, from 0.5 jg/ml to 250 jig/ml of the BiTE molecules. In a further embodiment, the composition according to the invention comprises from about 0.5 jg/ml to about 10 mg/ml, from about 0.5 jig/ml to about 5 mg/ml, from about 0.5 jig/ml to about 3.5 mg/ml, from about 0.5 jig/ml to about 3.0 mg/ml, from about 0.5 jig/ml to about 2.8 mg/ml, 20 from about 0.5 jg/ml to about 2.5 mg/ml, from about 0.5 jig/ml to about 2.3 mg/mi, from about 0.5 jig/ml to about 2.0 mg/ml, from about 0.5 jig/ml to about 1.8 mg/ml, from about 0.5 jig/ml to about 1.5 mg/ml, from about 0.5 pg/ml to about 1.3 mg/ml, from about 0.5 jig/ml to about 1.0 mg/ml, from about 0.5 pg/mil to about 350 pig/ml, from about 0.5 pg/ml to about 300 jig/ml, from about 0.5 jig/ml to about 250 pg/ml of the BiTE molecules. 25 In a particularly preferred embodiment, the composition according to the invention comprises about 2 mg/ml of the polypeptides according to the invention. In a further embodiment, the composition according to the invention comprises a combination of tris(hydroxymethyl)aminomethane (TRIS) and phosphate as buffering, pH-influencing agents. In a preferred embodiment, the composition according to the invention comprises TRIS in a 30 concentration of about 10 mM, or of about 20 mM, or of about 30 mM, or of about 40 mM, or of about 50 mM, or of about 60 mM, or of about 70 mM, or of about 80 mM, or of about 90 mM, or of about 100 mM, or of about 150 mM, or of about 200 mM, or of about 250 mM, or of about 300 mM and phosphate in a concentration of about 10 mM, or of about 20 mM, or of about 30 mM, or - 12 of about 40 mM, or of about 50 mM, or of about 60 mM, or of about 70 mM, or of about 80 mM, or of about 90 mM, or of about 100 mM, or of about 150 mM, or of about 200 mM. In a preferred embodiment, the composition according to the invention comprises TRIS in a concentration of 10 mM, or of 20 mM, or of 30 mM, or of 40 mM, or of 50 mM, or of 60 mM, or 5 of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 150 mM, or of 200 mM, or of 250 mM, or of 300 mM and phosphate in a concentration of about 10 mM, or of 20 mM, or of 30 mM, or of 40 mM, or of 50 mM, or of 60 mM, or of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 150 mM, or of 200 mM. In a preferred embodiment, the composition according to the invention comprises phosphate in a 10 concentration of about 10 mM, or of about 20 mM, or of about 30 mM, or of about 40 mM, or of about 50 mM, or of about 60 mM, or of about 70 mM, or of about 80 mM, or of about 90 mM, or of about 100 mM, or of about 110 mM, or of about 120 mM, or of about 130 mM, or of about 140 mM, or of about 150 mM, or of about 160 mM, or of about 170 mM, or of about 180 mM, or of about 190 mM, or of about 200 mM. 15 In a preferred embodiment, the composition according to the invention comprises phosphate in a concentration of 10 mM, or of 20 mM, or of 30 mlM, or of 40 mM, or of 50 mM, or of 60 mM, or of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 110 mlM, or of 120 mM, or of 130 mM, or of 140 mM, or of 150 mM, or of 160 mM, or of 170 mlM, or of 180 mM, or of 190 mM, or of 200 mM. 20 In a preferred embodiment, the composition according to the invention comprises about 2 mg/ml of the polypeptides according to the invention and TRIS in a concentration of 10 mM, or of 20 mM, or of 30 mM, or of 40 mlM, or of 50 mM, or of 60 mM, or of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 150 mM, or of 200 mM, or of 250 mTM, or of 300 mM and phosphate in a concentration of about 10 mM, or of 20 mM, or of 30 mM, or of 40 mM, or of 50 mM, or of 60 25 mM, or of 70 mlM, or of 80 mM, or of 90 mlM, or of 100 mM, or of 150 mM, or of 200 mM. In a preferred embodiment, the composition according to the invention comprises about 2 mg/ml of the polypeptides according to the invention and TRIS in a concentration of 10 mM, or of 20 mM, or of 30 mM, or of 40 mM, or of 50 mM, or of 60 mM, or of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 150 mlM, or of 200 mM, or of 250 mM, or of 300 mM and phosphate in a 30 concentration of about 10 mM, or of 20 mM, or of 30 mlM, or of 40 mM, or of 50 mM, or of 60 mlM, or of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 150 mM, or of 200 mM. In a preferred embodiment, the composition according to the invention comprises about 2 mg/ml of the polypeptides according to the invention and phosphate in a concentration of about 10 mM, or of about 20 mM, or of about 30 mM, or of about 40 mM, or of about 50 mM, or of about 60 mM, or - 13 of about 70 mM, or of about 80 mM, or of about 90 mM, or of about 100 mM, or of about 110 mM, or of about 120 mM, or of about 130 mM, or of about 140 mM, or of about 150 mM, or of about 160 mM, or of about 170 mM, or of about 180 mM, or of about 190 mM, or of about 200 mM. In a preferred embodiment, the composition according to the invention comprises about 2 mg/ml of 5 the polypeptides according to the invention and phosphate in a concentration of 10 mM, or of 20 mM, or of 30 mM, or of 40 mM, or of 50 mM, or of 60 mM, or of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 110 mM, or of 120 mM, or of 130 mM, or of 140 mM, or of 150 mM, or of 160 mM, or of 170 mM, or of 180 mM, or of 190 mM, or of 200 mM. In a preferred embodiment, the composition according to the invention comprises about 2 mg/ml of 10 the polypeptides according to the invention and TRIS in a concentration of about 100 mM and phosphate in a concentration of about 10 mlM, or of about 20 mM, or of about 30 mM, or of about 40 mM, or of about 50 mM, or of about 60 mM, or of about 70 mM, or of about 80 mM, or of about 90 mM, or of about 100 mM, or of about 110 mM, or of about 120 mM, or of about 130 mM, or of about 140 mM, or of about 150 mM, or of about 160 mM, or of about 170 mM, or of about 15 180 mM, or of about 190 mM, or of about 200 mM. In a preferred embodiment, the composition according to the invention comprises about 2 mg/ml of the polypeptides according to the invention and TRIS in a concentration of about 100 mM and phosphate in a concentration of 10 mM, or of 20 mM, or of 30 mM, or of 40 mM, or of 50 mM, or of 60 mM, or of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 110 mM, or of 120 mM, 20 or of 130 mM, or of 140 mlM, or of 150 mlM, or of 160 mM, or of 170 mM, or of 180 mM, or of 190 mM, or of 200 miM. In a preferred embodiment, the composition according to the invention comprises about 2 mg/ml of the polypeptides according to the invention and phosphate in a concentration of about 50 mlM and TRIS in a concentration of about 10 mM, or of about 20 mM, or of about 30 mM, or of about 40 25 mM, or of about 50 mM, or of about 60 mM, or of about 70 mM, or of about 80 mM, or of about 90 mM, or of about 100 mM, or of about 150 mM, or of about 200 mM, or of about 250 mM, or of about 300 mM and phosphate in a concentration of about 10 mM, or of about 20 mM, or of about 30 mM, or of about 40 mM, or of about 50 mM, or of about 60 mM, or of about 70 mM, or of about 80 mM, or of about 90 mlM, or of about 100 mM, or of about 150 mM, or of about 200 mnM. 30 In a preferred embodiment, the composition according to the invention comprises about 2 mg/ml of the polypeptides according to the invention and phosphate in a concentration of about 50 mM and TRIS in a concentration of of 10 mM, or of 20 mM, or of 30 mM, or of 40 mM, or of 50 mlM, or of 60 mM, or of 70 mM, or of 80 muM, or of 90 mM, or of 100 mM, or of 150 mM, or of 200 mM, or of 250 mM, or of 300 mM and phosphate in a concentration of about 10 mM, or of 20 mM, or of - 14 30 mM, or of 40 mM, or of 50 mM, or of 60 mM, or of 70 mM, or of 80 mM, or of 90 mM, or of 100 mM, or of 150 mM, or of 200 mM. In a preferred embodiment, the pH of the composition according to the invention is within a range from about 5.0 to about 7.0, or within a range from about 5.0 to about 6.5. Particularly preferably, 5 the pH of the composition according to the invention is 6.0. Preferably, the pH of the composition according to the invention is adjusted using HCL. In a further embodiment, the composition according to the invention additionally comprises a wetting agent. Examples of wetting agents are non-ionic wetting agents such as polysorbates (e.g. polysorbate 20 or 80); poloxamers (e.g. poloxamer 188); Triton; sodium octyl glycoside; lauryl, 10 myristyl, linoleyl, or stearyl sulphobetaine; lauroylsarcosine, myristoylsarcosine, linolcoylsarcosine, or stearoylsarcosine; linoleyl, myristyl, or cetyl betaine; lauroamidopropyl, cocamidopropyl, linoleamidopropyl, myristamidopropyl, palmitamidopropyl, or isostearamidopropyl betaine; polyethylene glycol; polypropylene glycol; and copolymers of ethylene and propylene glycol (e.g. Pluronics, PF68). In a preferred embodiment, the wetting agent 15 is polysorbate 80. In a further embodiment, the composition according to the invention comprises a wetting agent in a concentration of from 0.002% to 0.1%, preferably from 0.04% to 0.1%. hi a preferred embodiment, the composition according to the invention comprises polysorbate 80 in a concentration of from 0.002% to 0.1%, preferably from 0.04% to 0.1%. Particularly preferably, 20 the composition according to the invention comprises polysorbate 80 in a concentration of 0.04%. In a further embodiment, the composition according to the invention additionally comprises a lyoprotectant. In a further embodiment, the composition according to the invention additionally comprises a sugar or a sugar alcohol as lyoprotectant. The lyoprotectant is preferably trehalose or trehalose dihydrate. In a preferred embodiment, the composition according to the invention 25 comprises the lyoprotectant in a concentration of from 2% to 10%, particularly preferably 4%. In a preferred embodiment, the composition according to the invention comprises trehalose in a concentration of from 2% to 10%, particularly preferably 4%. In a particularly preferred embodiment, the composition according to the invention comprises trehalose dihydrate in a concentration of from 2% to 10%, particularly preferably 4%. 30 Pairticularly preferably, the composition according to the invention comprises from about 0.5 pg/mnl to about 2 mg/mI of the PSMA-BiTEl molecules and TRIS in a concentration of from about 50 mM to about 200 mM, phosphate in a concentration of from about 20 mM to about 100 mM, - 15 polysorbate 80 in a concentration of 0.04% and trehalose dihydrate in a concentration of 4%, and the pH is 6.0. Particularly preferably, the composition according to the invention comprises from about 0.5 gg/ml to about 2 mg/ml of the PSMA-BiTE1 molecules and TRIS in a concentration of from about 50 5 mM to about 200 mM, phosphate in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose dihydrate in a concentration of 4%, and the pH is 6.0. Particularly preferably, the composition according to the invention comprises from about 0.5 gg/ml to about 2 mg/ml of the PSMA-BiTE1 molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of from about 20 mM to about 100 mM, polysorbate 80 in a 10 concentration of 0.04% and trehalose dihydrate in a concentration of 4%, and the pH is 6.0. Particularly preferably, the composition according to the invention comprises from about 50 pLg/ml to about 2 mg/ml of the PSMA-BiTE1 molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose dihydrate in a concentration of 4%, and the pH is 6.0. 15 Particularly preferably, the composition according to the invention comprises from about 50 jig/ml to about 1 mg/mI of the PSMA-BiTE1 molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of about 50 mlM, polysorbate 80 in a concentration of 0.04% and trehalose dihydrate in a concentration of 4%, and the pH is 6.0. Particularly preferably, the composition according to the invention comprises from about 100 20 gg/ml to about 500 gg/ml of the PSMA-BiTEI molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose dihydrate in a concentration of 4%, and the pH is 6.0. Particularly preferably, the composition according to the invention comprises about 2 mg/ml of the PSMA-BiTEl molecules and TRIS in a concentration of about 100 mM, phosphate in a 25 concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose dihydrate in a concentration of 4%, and the pH is 6.0. Particularly preferably, the composition according to the invention comprises about 2 mg/ml of the PSMA-BiTEl molecules and TRIS in a concentration of about 100 mM, Na2I-P0 4 in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose dihydrate 30 in a concentration of 4%, and the p-I is 6.0. Preferably, the composition according to the invention comprises from about 0.5 pig/ml to about 2 mg/ml of the PSMA-BiTE1 molecules and TRIS in a concentration of from about 50 mM to about - 16 200 mM, phosphate in a concentration of from about 20 mM to about 100 mM, polysorbate 80 in a concentration of 0.04% and trehalose in a concentration of 4%, and the pH is 6.0. Preferably, the composition according to the invention comprises from about 0.5 jig/ml to about 2 mg/ml of the PSMA-BiTEI molecules and TRIS in a concentration of from about 50 mM to about 5 200 mM, phosphate in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose in a concentration of 4%, and the pH is 6.0. Preferably, the composition according to the invention comprises from about 0.5 jig/ml to about 2 mg/ml of the PSMA-BiTE1 molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of from about 20 mM to about 100 mlM, polysorbate 80 in a concentration of 10 0.04% and trehalose in a concentration of 4%, and the pH is 6.0. Preferably, the composition according to the invention comprises from about 50 jig/nil to about 2 mg/ml of the PSMA-BiTEl molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose in a concentration of 4%, and the pH is 6.0. 15 Preferably, the composition according to the invention comprises from about 50 jig/ml to about 1 mg/ml of the PSMA-BiTEI molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose in a concentration of 4%, and the pH is 6.0. Preferably, the composition according to the invention comprises from about 100 jig/ml to about 20 500 jsg/ml of the PSMA-BiTE1 molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose in a concentration of 4%, and the pH is 6.0. Preferably, the composition according to the invention comprises about 2 mg/ml of the PSMA BiTE1 molecules and TRIS in a concentration of about 100 mM, phosphate in a concentration of 25 about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose in a concentration of 4%, and the pH is 6.0. Preferably, the composition according to the invention comprises about 2 mg/ml of the PSMA BiTEl molecules and TRIS in a concentration of about 100 mM, Na 2

HPO

4 in a concentration of about 50 mM, polysorbate 80 in a concentration of 0.04% and trehalose in a concentration of 4%, 30 and the pH is 6.0. Indicated concentrations in per cent (%) refer to the concentration by mass (mass/volume).

- 17 In addition, the compositions according to the invention can contain yet further pharmaceutically acceptable additives (Remington's Pharmaceutical Sciences; 18th edition, Mack Publishing Co., Easton, PA, USA). Such additives are, for example, preservatives or antioxidants. Antioxidants which can be used are, for example, ascorbate, methionine, vitamin E, or sodium metabisulphite. 5 Preservatives are, for example, substances which suppress or slow the growth of microorganisms. Such a substances is, for example, thiomersal. One embodiment of the present invention is a solids mixture which is produced by lyophilization of the composition according to the invention, or is obtainable at least by lyophilization of said composition. 10 A preferred embodiment of the present invention is a lyophilisate obtainable by freeze-drying a composition according to the invention. A preferred embodiment of the present invention is a lyophilisate produced by freeze-drying a composition according to the invention as per the protocol described in example 16. In a further embodiment, the composition according to the invention is provided by reconstituting 15 the lyophilized solids mixture by dissolution in a suitable liquid medium. In a preferred embodiment, the composition according to the invention is provided by reconstituting the lyophilized solids mixture by dissolution in water, preferably sterile water. The invention further provides a product which contains one of the compositions according to the invention and preferably also instructions for use. In one embodiment, the product comprises a 20 container which contains one of the above-listed compositions. Useful containers are, for example, bottles, vials, tubes or syringes. The containers can, for example, be composed of glass or plastic. Syringes can comprise an injection needle composed, for example, of metal. In one embodiment, the container is a syringe. In a further embodiment, the syringe is contained in an injection device. In a preferred embodiment, the injection device is an auto-injector. An auto 25 injector can be described as an injection instrument which, after activation, administers its contents without additional handling by the patient or another person. In the present invention, administration is preferably subcutaneous. The compositions according to the invention exhibit increased stability and significantly increased bioavailability compared to the formulations available in the prior art for BiTE molecules. Owing 30 to this property profile, the compositions according to the invention are especially suitable for parenteral administration. Parenteral administration includes, inter alia, intravenous injection or infusion, intra-arterial injection or infusion (into an artery), intra-muscular injection, intra-thecal -18 injection, subcutaneous injection, intra-peritoneal injection or infusion, intra-osseous administration or injection into a tissue. The compositions according to the invention are especially suitable for subcutaneous administration. One embodiment of the composition according to the invention is characterized in that the bioavailability of the polypeptide after subcutaneous 5 administration of the composition is >60%; preferably, this is the bioavailability in a cynomolgus monkey The compositions according to the invention have valuable pharmacological properties and can be used for the prevention and treatment of diseases in humans and animals. The compositions according to the invention are suitable in general for the treatment of hyper 10 proliferative diseases in humans and in manuals. Hyper-proliferative diseases, for the treatment of which it is possible to use the compositions according to the invention, belong in particular to the group of cancer and tumour diseases. In the context of the present invention, these are understood to mean especially the following diseases, but without any limitation thereto: mammary carcinomas and mammary tumours (ductal and lobular forms, also in situ), tumours of the respiratory tract 15 (parvicellular and non-parvicellular carcinoma, bronchial carcinoma), cerebral tumours (e.g. of the brain stem and of the hypothalamus, astrocytoma, medulloblastoma, ependymomna and neuro ectodennal and pineal tumours), tumours of the digestive organs (oesophagus, stomach, gall bladder, small intestine, large intestine, rectum), liver tumours (inter alia hepatocellular carcinoma, cholangiocarcinoma and mixed hepatocellular cholangiocarcinoma), tumours of the head and neck 20 region (larynx, hypopharynx, nasopharynx, oropharynx, lips and oral cavity), skin tumours (squamous cell carcinoma, Kaposi's sarcoma, malignant melanoma, Merkel cell skin cancer and non-melanomatous skin cancer), tumours of soft tissue (inter alia soft tissue sarcomas, osteosarcomas, malignant fibrous histiocytomas, lymphosarcomas and rhabdomyosarcomas), tumours of the eyes (inter alia intraocular melanoma and retinoblastoma), tumours of the endocrine 25 and exocrine glands (e.g. thyroid and parathyroid glands, pancreas and salivary gland), tumours of the urinary tract (tumours of the bladder, penis, kidney, renal pelvis and ureter) and tumours of the reproductive organs (carcinomas of the endometrium, cervix, ovary, vagina, vulva and uterus in women and carcinomas of the prostate and testes in men). These also include proliferative blood diseases in solid fonn and as circulating blood cells, such as lymphomas, leukaemias and 30 myeloproliferative diseases, for example acute myeloid, acute Iymphoblastic, chronic lymphocytic, chronic myelogenous and hairy cell leukaemnia, and AIDS-correlated lymphomas, Hodgkin's lymphomas, non-Hodgkin's lymphomas, cutaneous T cell lymphomas, Burkitt's lymphomas and lymphomas in the central nervous system. Preferred diseases, for the treatment of which it is possible to use the compositions according to the 35 invention, are carcinomas and/or metastases which express the PSMA antigen.

- 19 A particularly preferred disease, for the treatment of which it is possible to use the compositions according to the invention, is selected from the group consisting of prostate carcinoma, bone metastases of the prostate carcinoma and soft tissue metastases of the prostate carcinoma. A further particularly preferred disease, for the treatment of which it is possible to use the 5 compositions according to the invention, is prostate carcinoma. These well described diseases in humans can also occur with a comparable aetiology in other mammals and can be treated there with the compositions of the present invention. In the context of this invention, the term "treatment" or "treat" is used in the conventional sense and means attending to, caring for and nursing a patient with the aim of combating, reducing, 10 attenuating or alleviating a disease or health abnormality, and improving the quality of life impaired by this disease, as, for example, in the event of a cancer. The present invention thus further provides for the use of the compositions according to the invention for the treatment and/or prevention of diseases, more particularly the above-mentioned diseases. 15 The present invention further provides for the use of the compositions according to the invention for producing a medicinal product for the treatment and/or prevention of diseases, more particularly the above-mentioned diseases. The present invention further provides for the use of the compositions according to the invention in a method for treating and/or preventing diseases, more particularly the above-mentioned diseases. 20 The present invention further provides a method for treating and/or preventing diseases, more particularly the above-mentioned diseases, using an effective amount of one of the compositions according to the invention. In a preferred embodiment, the treatment and/or prevention is parenteral administration of the composition according to the invention. Particular preference is given to subcutaneous 25 administration. The compositions according to the invention can be used alone or, if required, in combination with one or more other pharmacologically active substances, provided that this combination does not lead to undesirable and unacceptable side effects. The present invention therefore further provides medicinal products containing at least one of the compositions according to the invention and one 30 or more further active ingredients, especially for the treatment and/or prevention of the above mentioned diseases. For example, the compounds of the present invention can be combined with -20 known anti-hyper-proliferative, cytostatic or cytotoxic substances for the treatment of cancer diseases. The invention further provides for the use of the above-mentioned compositions in a therapeutic method, the composition being suitable for parenteral forms of administration, such as intravenous 5 injection or infusion, intra-arterial injection or infusion (into an artery), intra-muscular injection, intra-thecal injection, subcutaneous injection, intra-peritoneal injection or infusion, intra-osseous administration or injection into a tissue. The invention further provides for the use of the above-mentioned compositions in a method for therapeutically treating cell-proliferative diseases of the prostate. 10 The invention further provides for the use of the above-mentioned compositions in a method for therapeutically treating cell-proliferative diseases of the prostate, the composition being suitable for subcutaneous administration. The invention further provides for the use of the above-mentioned compositions in a method for therapeutically treating cell-proliferative diseases of the prostate, the composition being 15 administered by subcutaneous administration. The invention further provides a method for stabilizing polypeptides, comprising the production of one of the above-mentioned compositions, which contains, in addition to the polypeptides, at least TRIS and phosphate and has a pH of 6.0. The invention further provides a kit which comprises the above-mentioned compositions. 20 Preferred compounds in the context of the present invention are pharmaceutical compounds. Embodiments One embodiment of the present invention comprises a liquid pharmaceutical composition comprising a polypeptide, TRIS and phosphate, the polypeptide comprising two scFv antibody binding domains, the first scFv binding domain being able to bind to human CD3 epsilon, 25 In a further embodiment of the composition, the second binding domain of the polypeptide can bind to a cell surface antigen. In a further embodiment of the composition, the polypeptide comprises a second binding domain which can bind to a surface antigen of a cancer cell. In a further embodiment, the surface antigen to which the second binding domain of the 30 polypeptide can bind is prostate-specific membrane antigen (PSMA).

-21 In a further embodiment of the composition, the polypeptide has the arrangement (VH-VL) binding domain 2 - (VH-VL) binding domain 1. In a further embodiment of the composition, the first binding domain of the polypeptide comprises the amino acid sequence reproduced in SEQ ID NO: 5. 5 In a further embodiment of the composition, the second, PSMA-binding binding domain of the polypeptide comprises the amino acid sequence reproduced in SEQ ID NO: 6. In a further embodiment of the composition a polypeptide, TRIS and phosphate, the polypeptide comprising the amino acid sequence reproduced in SEQ ID NO: 7. In a further embodiment, the composition comprises a polypeptide, TRIS and phosphate, the 10 polypeptide comprising the amino acid sequence reproduced in SEQ ID NO: 8. In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 gg/ml to 5 mg/ml. In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 gg/ml to 3.5 mg/ml. 15 In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 jig/ml to 3.0 mg/mil. In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 pg/ml to 2.5 mg/ml. In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 20 ug/ml to 2.0 mg/ml. In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 ptg/ml to 1.8 mg/ml. In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 pg/ml to 1.5 mg/ml. 25 In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 pg/ml to 0.35 mg/ml. In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 jg/ml to 0.3 mg/ml.

-22 In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 Vg/mi to 0.25 mg/ml. In a further embodiment, the composition contains the polypeptide in a concentration of from 0.5 pg/ml to 0.2 mg/ml. 5 In a further embodiment, the composition comprises the PSMA-BiTE in a concentration of from 50 jg/ml to 1 mg/ml. In a further embodiment, the composition comprises the PSMA-BiTEI in a concentration of from 50 pg/ml to 500 jg/ml. In a further embodiment, the composition comprises the PSMA-BiTEI in a concentration of from 10 100 jig/ml to 500 pg/ml. In a further embodiment, the composition contains the polypeptide in a concentration of about 2 mg/ml. In a further embodiment, the composition contains TRIS in a concentration of from about 50 mM to about 200 mM and phosphate in a concentration of from about 20 mM to about 100 mM. 15 In a further embodiment, the composition contains 100 mM TRIS and 50 mM phosphate. In a further embodiment, the pH of the composition is within a range from about 5.0 to about 7.0. In a further embodiment, the pH of the composition is within a range from about 5.0 to about 6.5. In a further embodiment, the pH of the composition is within a range from about 5.5 to about 6.5. In a further embodiment, the pH of the composition is about 6.0. 20 In a further embodiment, the pH of the composition is adjusted using hydrochloric acid. In a further embodiment, the composition additionally contains a wetting agent. In a further embodiment, the wetting agent is polysorbate 80. In a further embodiment, the composition additionally contains from 0.002% to 0.1% polysorbate 80. 25 In a further embodiment, the composition additionally contains from 0.04% to 0.1% polysorbate 80. In a further embodiment, the composition additionally contains 0.04% polysorbate 80.

- 23 In a further embodiment, the composition additionally contains a lyoprotectant. In a further embodiment, the composition contains trehalose or preferably trehalose dihydrate as lyoprotectant. In a further embodiment, the composition additionally contains from 4% to 10% trehalose or 5 preferably from 4% to 10% trehalose dihydrate. In a further embodiment, the composition additionally contains about 4% trehalose or preferably additionally about 4% trehalose dihydrate. In a preferred embodiment, the composition has a pH of 6 and comprises from 50 pLg/ml to 1 mg/ml PSMA-BiTE1, 100 mM TRIS, 50 mM phosphate, 0.04% polysorbate 80 and 4% trehalose 10 dihydrate. In a preferred embodiment, the composition has a pH of 6 and comprises from 50 jig/ml to 500 jig/ml PSMA-BiTEI, 100 mM TRIS, 50 mM phosphate, 0.04% polysorbate 80 and 4% trehalose dihydrate. In a preferred embodiment, the composition has a pH of 6 and comprises from 50 jig/ml to 500 15 pg/ml PSMA-BiTE1, 100 mM TRIS, 50 mM Na 2 HP0 4 , 0.04% polysorbate 80 and 4% trehalose dihydrate. In a further embodiment, the composition has a pH of 6 and comprises from 50 pg/ml to 1 mg/ml PSMA-BiTEI, 100 mM TRIS, 50 mM phosphate, 0.04% polysorbate 80 and 4% trehalose. In a further embodiment, the composition has a pH of 6 and comprises from 50 pg/ml to 500 jig/ml 20 PSMA-BiTEI, 100 mM TRIS, 50 mM phosphate, 0.04% polysorbate 80 and 4% trehalose. In a further embodiment, the composition has a pH of 6 and comprises from 50 jg/ml to 500 jg/ml PSMA-BiTE1, 100 mM TRIS, 50 mM Na 2

HPO

4 , 0.04% polysorbate 80 and 4% trehalose. In a preferred embodiment of the composition, the polypeptide has a bioactivity of at least 90% and preferably at least 96% (preferably ascertained by cell-based activity assay as described in example 25 21) following lyophilization and subsequent reconstitution and storage (7 days at 2-8*C and subsequently 16 hours at 20*C+- 5*C, as described in example 21). In a preferred embodiment of the composition, the polypeptide has a bioactivity of at least 90% and preferably at least 96% (preferably ascertained by cell-based activity assay as described in example 21) following lyophilization and storage for 3 months or 12 months.

- 24 In a preferred embodiment of the composition, the polypeptide has a bioactivity of at least 97% (preferably ascertained by cell-based activity assay as described in example 21) following lyophilization and storage for 3 months at 6*C or 12 months at 64C. In a preferred embodiment of the composition, the polypeptide has a monomer content (SEC) of 5 more than 96% (preferably ascertained as per example 18a) following the action of shear stress resulting from injection. In a preferred embodiment of the composition, the polypeptide has a dimer and multimer content (SEC) of not more than 4% (preferably ascertained as per example 18a) following the action of shear stress resulting from slow or rapid injection using a needle. 10 In a preferred embodiment of the composition, the polypeptide has a dimer and multimer content (SEC) of not more than 4% (preferably ascertained as per example 18a) following the action of shear stress resulting from slow or rapid injection using a needle (gauge: 30 G; needle length: 13 mm). One embodiment of the present invention comprises a solids mixture obtainable by lyophilization 15 of the liquid composition. In a further embodiment, the composition is reconstituted by dissolving the lyophilized solids mixture according to the invention in a suitable liquid medium. In a further embodiment, the bioavailability of the polypeptide following subcutaneous administration of the composition is >60%. 20 In a further embodiment, the composition is used in a therapeutic method. In a further embodiment, the composition is used in a therapeutic method, said method comprising parenteral administration of the composition. In a further embodiment, the composition is used in a method for therapeutically treating hyper proliferative diseases. 25 In a further embodiment, the composition is used in a method for therapeutically treating hyper proliferative diseases of the prostate. In a further embodiment, the composition is used in a method for therapeutically treating hyper proliferative diseases of the prostate, the method comprising subcutaneous administration of the composition.

- 25 In a further embodiment, the present invention comprises a method for stabilizing polypeptides, comprising the production of a composition which contains, in addition to the polypeptides, at least TRIS and phosphate and has a pH of 6.0. In a further embodiment, the present invention comprises a kit comprising the above-described 5 composition. Preferred embodiments are 1. A liquid pharmaceutical composition comprising a polypeptide, TRIS and phosphate, the polypeptide comprising two scFv antibody binding domains, the first scFv binding domain being able to bind to human CD3 epsilon. 10 2. A composition according to embodiment 1, characterized in that the second binding domain of the polypeptide can bind to a cell surface antigen. 3. A composition according to embodiment 2, characterized in that the polypeptide comprises a second binding domain which can bind to a surface antigen of a cancer cell. 4. A composition according to either of embodiments 2 and 3, characterized in that the 15 surface antigen is prostate-specific membrane antigen (PSMA). 5. A composition according to any of the preceding embodiments, characterized in that the polypeptide has the arrangement (VH-VL)jnding domain 2-(VH-VL)iading domain 1. 6. A composition according to any of the preceding embodiments, characterized in that the first binding domain of the polypeptide comprises the amino acid sequence reproduced in 20 SEQ ID NO: 5. 7. A composition according to any of the preceding embodiments, characterized in that the second, PSMA-binding binding domain of the polypeptide comprises the amino acid sequence reproduced in SEQ lID NO: 6. 8. A liquid pharmaceutical composition comprising a polypeptide, TRIS and phosphate, the 25 polypeptide comprising the amino acid sequence reproduced in SEQ ID NO: 7. 9. A liquid pharmaceutical composition comprising a polypeptide, TRIS and phosphate, the polypeptide comprising the amino acid sequence reproduced in SEQ ID NO: 8. 10. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 gg/ml to 5 mg/ml.

- 26 11. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 jg/ml to 3.5 mg/ml. 12. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 sg/ml to 3.0 mg/ml. 5 13. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 pg/ml to 2.5 mg/ml. 14. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 pg/ml to 2.0 mg/ml. 15. A composition according to any of the preceding embodiments, characterized in that the 10 composition contains the polypeptide in a concentration of from 0.5 pig/ml to 1.8 mg/mL. 16. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 jg/ml to 1.5 mg/ml. 17. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 jg/ml to 0.35 mg/mL. 15 18. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 sg/ml to 0.3 mg/ml. 19. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of from 0.5 pg/ml to 0.25 mg/ml. 20. A composition according to any of the preceding embodiments, characterized in that the 20 composition contains the polypeptide in a concentration of from 0.5 pg/ml to 0.2 mg/mL. 21. A composition according to any of the preceding embodiments, characterized in that the composition comprises the PSMA-BiTE1 in a concentration of from 50 jig/ml to 1 mg/ml. 22. A composition according to any of the preceding embodiments, characterized in that the composition comprises the PSMA-BiTE1 in a concentration of from 50 jig/nl to 500 25 pg/mL. 23. A composition according to any of the preceding embodiments, characterized in that the composition comprises the PSMA-BiTE1 in a concentration of from 100 pg/ml to 500 pg/ml.

- 27 24. A composition according to any of the preceding embodiments, characterized in that the composition contains the polypeptide in a concentration of about 2 mg/ml. 25. A composition according to any of the preceding embodiments, characterized in that the composition contains TRIS in a concentration of from about 50 mM to about 200 mM and 5 phosphate in a concentration of from about 20 mM to about 100 mM, 26. A composition according to any of the preceding embodiments, characterized in that the composition contains 100 mM TRIS and 50 nM phosphate. 27. A composition according to any of the preceding embodiments, characterized in that the pH of the composition is within a range from about 5.0 to about 7.0. 10 28. A composition according to any of the preceding embodiments, characterized in that the pH of the composition is within a range from about 5.0 to about 6.5. 29. A composition according to any of the preceding embodiments, characterized in that the pH of the composition is within a range from about 5.5 to about 6.5. 30. A composition according to any of the preceding embodiments, characterized in that the 15 pH of the composition is about 6.0. 31. A composition according to any of the preceding embodiments, characterized in that the pH of the composition is adjusted using hydrochloric acid. 32. A composition according to any of the preceding embodiments, characterized in that the composition additionally contains a wetting agent. 20 33. A composition according to any of embodiment 32, characterized in that the wetting agent is polysorbate 80. 34. A composition according to any of the preceding embodiments, characterized in that the composition additionally contains from 0.002% to 0.1% polysorbate 80. 35, A composition according to any of the preceding embodiments, characterized in that the 25 composition additionally contains from 0.04% to 0.1% polysorbate 80. 36. A composition according to any of the preceding embodiments, characterized in that the composition additionally contains 0,04% polysorbate 80.

-28 37. A composition according to any of the preceding embodiments, characterized in that the composition additionally contains a lyoprotectant. The composition contains preferably 2 10% of a lyoprotectant, particularly preferably 4%. 38. A composition according to embodiment 37, characterized in that the lyoprotectant is 5 trehalose. The lyoprotectant is preferably trehalose dihydrate. 39. A composition according to any of the preceding embodiments, characterized in that the composition additionally contains from 4% to 10% trehalose dihydrate. 40. A composition according to any of the preceding embodiments, characterized in that the composition additionally contains about 4% trehalose dihydrate. 10 41. A composition according to any of the preceding embodiments, characterized in that the composition has a pH of 6 and comprises from 50 gg/ml to I mg/ml PSMA-BiTEI, 100 mM TRIS, 50 mM phosphate, 0.04% polysorbate 80 and 4% trehalose dihydrate. 42. A composition according to any of the preceding embodiments, characterized in that the composition has a pH of 6 and comprises from 50 g/ml to 500 pg/ml PSMA-BiTE1, 100 15 mM TRIS, 50 mM phosphate, 0.04% polysorbate 80 and 4% trehalose dihydrate. 43. A composition according to any of the preceding embodiments, characterized in that the composition has a pH of 6 and comprises 2 mg/mI PSMA-BiTE1, 100 mM TRIS, 50 mM Na 2

HPO

4 , 0.04% polysorbate 80 and 4% trehalose dihydrate. 44. A solids mixture obtainable by lyophilization of a liquid composition according to any of 20 the preceding embodiments. 45. A liquid pharmaceutical composition, characterized in that the composition is reconstituted by dissolving a lyophilized solids mixture according to embodiment 44 in a suitable liquid medium. 46. A composition according to any of the preceding embodiments, wherein the polypeptide 25 has a bioactivity of at least 90% and preferably at least 96% (preferably ascertained by cell based activity assay as described in example 21) following lyophilization and subsequent reconstitution and storage (7 days at 2-8*C and subsequently 16 hours at 20*C+- 5*C, as described in example 21). 47. A composition according to any of the preceding embodiments, wherein the polypeptide 30 has a bioactivity of at least 90% and preferably at least 96% (preferably ascertained by cell- -29 based activity assay as described in example 21) following lyophilization and storage for 3 months or 12 months. 48. A composition according to any of the preceding embodiments, wherein the polypeptide has a bioactivity of at least 97% (preferably ascertained by cell-based activity assay as 5 described in example 21) following lyophilization and storage for 3 months at 6C or 12 months at 64C. 49. A composition according to any of the preceding embodiments, wherein the polypeptide has a monomer content (SEC) of more than 96% (preferably ascertained as per example 18a) following the action of shear stress resulting from injection. 10 50. A composition according to any of the preceding embodiments, wherein the polypeptide has a dimer and multimer content (SEC) of not more than 4% (preferably ascertained as per example 18a) following the action of shear stress resulting from slow or rapid injection using a needle. 51. A composition according to any of the preceding embodiments, wherein the polypeptide 15 has a dimer and multimer content (SEC) of not more than 4% (preferably ascertained as per example 18a) following the action of shear stress resulting from slow or rapid injection using a needle (gauge: 30 G; needle length: 13 mm). 52. A composition according to any of the preceding embodiments, characterized in that the bioavailability of the polypeptide following subcutaneous administration of the 20 composition is >60%. 53. A composition according to any of the preceding embodiments for use in a therapeutic method. 54. A composition according to any of the preceding embodiments for use in a therapeutic method, said method comprising parenteral administration of the composition. 25 55. A composition according to any of the preceding embodiments for use in a method for therapeutically treating hyper-proliferative diseases. 56. A composition according to any of the preceding embodiments for use in a method for therapeutically treating hyper-proliferative diseases of the prostate. 57. A composition according to any of the preceding embodiments for use in a method for 30 therapeutically treating hyper-proliferative diseases of the prostate, the method comprising subcutaneous administration of the composition.

- 30 58. A method for stabilizing polypeptides according to at least one of embodiments 1 to 9, comprising the production of a composition which contains, in addition to the polypeptides, at least TRIS and phosphate and has a pH of 6.0. 59. A kit comprising the composition according to any of embodiments 1-57. 5 60. A composition according to any of the preceding embodiments, wherein the liquid phannaceutical composition is an aqueous pharmaceutical composition, preferably a sterile aqueous phannaceutical composition. 61. Syringe containing a composition according to any of the preceding embodiments.

-31 Examples Example 1: Buffer screening in order to improve the thermal stability of the PSMA-BiTE1 molecules 5 Differential scanning fluorimetry (DSF) was used to measure the mean melting point (T 0 1 ) of the PSMA-BiTE1 protein domain with the lowest molecular weight in different buffer systems. It is a measure of the stability of the examined protein in the various buffer systems: the greater the Tm 1 1 value, the greater, too, the thermal stability of the protein. The greater the thermal stability of a protein, the better its suitability for producing stable pharmaceutical formulations. 10 For the buffer screening, standard buffers in a pH range from pH 5.0 to 8.0 were used. The PSMA BiTEi concentration of the formulations produced was about 0.2 mg/ml. The mean melting point was ascertained by the DSF method. Tab. 1: PSMA-BITE1 (0.2 mg/n) in various buffer systems (50 mM) pH Na 2

HPO

4 Citrate Histidine Glycine Lysine Tml [*C] Tml [*C} Tml foC] Tml [*C] Tml [*C] 5.0 61.2 63.6 - 5.5 63.5 63.1 60.8 - 60 63.4 63.5 61.4 60.2 61.6 6.5 63.8 64.6 60.7 58.7 61.5 7.0 63.3 - 60.4 60.7 61.4 7.5 63.1 - 57.7 61.4 61.4 8.0 63.0 - 59.3 15 The buffer systems based on citrate and Na 2

HPO

4 exhibited a positive effect with respect to increasing the melting point of the PSMA-BiTE1 protein domain. The positive effects of citrate and Na 2

HPO

4 were followed up in further experiments.

- 32 Tris(hydroxymethyl)aminomethane (TRIS)-based buffers alone did not lead to a distinct increase in the protein melting point (table 2). Tab. 2: PSMA-BiTE] (0.2 mg/ni) in various buffer systems (50 mM) (continuation of tab. 1) pH HEPES TRIS MOPS Acetate TmIl [*C] Tml [*C] Tml [-C] Tml [*C] 6.5 - 61.7 62.5 61.9 7.0 62.2 61.4 61.8 7.5 61.4 - 62.6 8.0 61.4 62.4 5 Like table 1, table 2 also shows the mean melting point (Tin), as ascertained by differential scanning fluorimetry, of the PSMA-BiTEI protein domain with the lowest molecular weight in different buffer systems. The Tm values were between 57.7*C and 64.6*C. Through the combination of various buffer systems, it was not possible to attain higher Tm values. The PSMA-BiTE1 formulations in phosphate buffer at pH 5.5-6.5 and in citrate buffer at pH 5.0 10 6.5 exhibited the highest melting points (Tm > 63.04C according to the DSF method). Example 2: The influence of non-ionic surfactants on PSMA-BiTE1 aggregate formation The PSMA-BiTE1 molecules formed aggregates following the agitation stress test in all buffer systems tested. The efficiency with which aggregated PSMA-BiTEI molecules bring about T-cell 15 activation is not predictable or controllable, or only predictable or controllable to a limited extent. Therefore, it was imperative to find a stabilizer which prevents the aggregate formation resulting from agitation stress or the action of shear forces. In the agitation stress test, it became apparent that various non-ionic surfactants (e.g. polysorbate 80 or 20) stabilize the PSMA-BiTEl molecules and can prevent aggregation. Surfactant concentrations between 0.01 and 0.04% (mass/volume) 20 were sufficient for stabilization (see tables 3-7). Example 3: PSMA-BiTE1 dimer formation in the presence of polyvalent cations -33 A rise in the proportion of PSMA-BiTEl aggregates during the concentration of PSMA-BiTE formulations could not be prevented by adding non-ionic surfactants. Therefore, the electrostatic stabilization of the PSMA-BiTEI molecules in the presence of polyvalent cations (e.g. Mg2+ and Ca2+) was examined. Polyvalent ions have a direct influence on 5 the surface potential of dissolved proteins and can thus act in a stabilizing or even destabilizing manner. The PSMA-BiTEI molecules can be stabilized using magnesium chloride. The proportion of PSMA-BiTE1 diners rose only negligibly following concentration and remained below <3% (table 3). The proportions of monomers and diners were measured via size-exclusion chromatography 10 (SEC). Tab. 3: PSMA-BiTE] molecules after concentration (in 50 mM Na 2

HPO

4 and 50 mM lysine, pH 7.3) Additives during Protein content Monomers Dimers concentration [mg/ml] [%] [%] - 2.04 95.7 4.3 0.04% (mass/volume) polysorbate 2.09 91.2 8.8 20 100 mzMMgC2 2.13 98.1 1.9 SEC = size-exclusion chromatography However, the addition of inorganic salts in higher concentrations is not pharmaceutically safe, 15 and/or said additives represent a challenge in freeze-drying. For this reason, a search was carried out for alternative excipients which stabilize the PSMA-BiTE1 molecules and are, at the same time, pharmaceutically safe. Example 4: Identification of alternative excipients for stabilizing the PSMA-BiTE1 20 monomers By chance, various amino acids and the derivatives thereof were, inter alia, included in the tests on stabilizing the PSMA-BiTE1 monomers in higher concentrations. Amino acids and the derivatives thereof are not inorganic salts and are therefore classified as pharmaceutically safe. Some of these - 34 substances (e.g. lysine) exhibited, surprisingly, a positive influence on the stability of the PSMA BiTEl molecules during and after concentration (table 4). Tab. 4: PSMA-BiTE1 molecules after concentration atpH 7.3 Buffer Protein SEC SEC DLS State after agitation stress content Monomers Dimers Median [mg/ml] [%] [%] [nm] 50 mMNa 2

HPO

4 + 50 mMlysine 1.94 95.1 4.9 11 Turbid 0.02% (mass/volume) polysorbate 20, 10% trehalose dihydrate 50 mMNa 2 HP0 4 + 100 mM lysine 1.88 97.5 2.5 9 Turbid 0.04% (mass/volume) polysorbate 20, 10% rehalose dihydrate 10 mMNa2HPO 4 + 50 mMlysine 2.15 92.4 7.6 10 OK + 100 mM histidine 0.04% (mass/volume) polysorbate 20, 10% trehalose dihydrate SEC = size-exclusion chromatography; DLS = dynamic light scattering; a turbid solution following 5 agitation stress indicates a high proportion of BiTE aggregates, a clear or minimally clouded solution (state "OK") indicates a negligible degree of aggregation. By adding lysine and histidine in a phosphate buffer, the PSMA-BiTE1 molecules could be concentrated without the formation of unacceptable proportions of dimers (>5%). However, the formulations in which the proportion of dimers was low (<5%) destabilized during the agitation 10 stress test, and this was recognizable from the clouding of the solution (test volumes 1 and 2; "Turbid" indicates aggregation, "OK" indicates little or no aggregation). Example 5: Influence of pH on the stability of the PSMA-BiTE1 molecules To examine the influence of pH on dimer fonnation, a fonnulation having pH 6.0 was produced. It exhibited a proportion of dimers which was comparable to those of the formulations at pH 7.3. 15 Furthermore, the proportion of dimers was also stable during agitation stress, and this was apparent - 35 from the lack of clouding (table 5). The positive influence of pH 6.0 was used for the additional search for suitable stabilizers and formulations. Tab. 5: PSMA-BiTEl molecules after concentiration atpH 6.0 Buffer at pH6.0 Protein SEC SEC DLS State after agitation content Monomers Dimers Median stress [mg/ml] [%] [%] [nm] 50 mMNa 2

HPO

4 + 50 mM lysine 1.62 95.7 4.3 8 OK 0.04% (iass/volne) polysorbate 20, 10% (mass/volume) trehalose dihydrate SEC = size-exclusion chromatography; DLS = dynamic light scattering 5 The PSMA-BiTE1 stability in the phosphate buffer at pH 6.0 was astonishing. It was possible to suddenly concentrate the molecules to 1.6 mg/ml in a formulation comprising 50 mM Na 2 HPO4, 50 mM lysine 0.04% polysorbate 20 and 10% trehalose dihydrate at pH 6.0, without aggregation occurring as a result of the action of agitation stress. 10 Example 6: Examination of buffer combinations In a further experiment, a possible synergistic effect with regard to an increase in the stability of the PSMA-BiTEI molecules by additives such as arginine, TEA or TRIS in combination with phosphate was examined. The lowest proportion of PSMA-BiTE1 diners of 0.8% occurred in the case of the buffer combination 50 mM Na 2 HP0 4 , 100 mM TRIS at pH 6.0. The formulation was 15 also sufficiently stable after agitation stress, and this was recognizable from the absent clouding of the solution (table 6). The stabilizing effect of TRIS was surprising, since the addition of arginine or TEA, which are both known for their stabilizing (i.e. aggregation-reducing) effect in the case of proteins, had no stabilizing effect in the case of the PSMA-BiTE molecules.

- 36 Tab. 6: PSMA-BiTEI molecules after concentration with various additives at pH 6.0 Buffer at pH 6.0 Protein SEC SEC DLS State after agitation content Monomers Dimers Median stress [mg/ml] [%] [%] [nm] 50 mMNa 2

HPO

4 1.82 96.4 3.3 13 OK 0.04% (mass/volume) polysorbate 80, 4% (mass/volume) trehalose dihydrate 50 mM Na 2

HPO

4 + 100 1.81 99.2 0.8 12 OK mM TRIS 0.04% (mass/volume) polysorbate 80, 4% (mass/volwne) trehalose dihydrate 50 mM Na 2

HPO

4 + 100 2.20 96.2 3.5 15 OK mM arginine 0.04% (mass/volume) polysorbate 80, 4% (mass/voline) trehalose dihydrate 50mMNa 2

HPO

4 + 100 1.88 96.2 3.4 11 OK mM TEA 0.04% (mass/volume) polysorbate 80, 4% (mass/volwne) trehalose dihydrate SEC = size-exclusion chromatography; DLS = dynamic light scattering - 37 As shown in example 1, the use of citrate buffer led to an increase in the thermal stability of PSMA-BiTEl molecules. However, after concentration of the test volumes, the proportion of dimers in the citrate-buffered test volumes was substantially higher than in those with phosphate buffer (table 7 compared with table 6). Phosphate buffer is consequently better suited than citrate 5 buffer for minimizing the formation of PSMA-BiTEl dimers during concentration. Also, citrate in a formulation can lead to glass delamination and should no longer be used. Tab. 7: PSMA-BiTEl molecules after concentration at pH 6.0 Buffer Protein SEC SEC DLS State after agitation stress content Monomers Dimers Median [mg/mi [%] [%] [nm] 50 mM citrate 1.90 93.4 6.4 11 OK 0.04% (mass/volume) polysorbate 80, 4% (mass/volume) trehalose dihydrate 50 mM citrate + 100 mM TRIS 1.95 92.9 7.0 12 OK 0.04% (mass/volume) polysorbate 80, 4% (mass/volume) trehalose dihydrate SEC = size-exclusion chromatography; DLS = dynamic light scattering 10 Example 7: Thermal stability of the PSMA-BiTE1 molecules in TRIS-phosphate buffer systems The mean melting point (T, 1 ) of the PSMA-BiTE1 protein domain with the lowest molecular weight of the following formulation was determined: 0.2 mg/mi PSMA BiTE in 50 mM Na 2

HPO

4 , 100 mM TRIS, 0.04% polysorbate 80, 4% trehalose 15 dihydrate, pH 6.0 (adjusted with HCl). By means of DSC, a T,, of 61.1*C was measured.

-38 Example 8: Influence of agitation stress on PSMA-BiTEI molecules in phosphate/TRIS formulations In general, BiTE molecules are physically destabilized by agitation stress, i.e. they forn aggregates, which can be detected via Dynamic Light Scattering (DLS). The fonnation of 5 aggregates even takes place at low BiTE concentrations of about 0.2 mg/ml. By contrast, in the case of a protein content of below 0.2 mg/ml, the BiTE molecules increasingly adsorb to the vessel wall. By adding a surfactant (e.g. polysorbate 20 or 80), it was possible to prevent the adsorption of the PSMA-BiTEl molecules to the vessel wall (e.g. of injection syringes, infusion bags, etc.) in some 10 buffer systems (e.g. in phosphate- and lysine-based buffers), and similarly the formation of aggregates in the resting state. Polysorbate 80 must be present in a concentration of at least 0.002% in the composition in order to prevent the adsorption of the PSMA-BiTE1 molecules. By dissolving the PSMA-BiTE1 molecules in a phosphate buffer with surfactant additive at pH 6.0, it was possible to prevent the formation of aggregates both in the resting state and during the action 15 of agitation stress. The aforementioned fonnulation (phosphate buffer with surfactant additive at pH 6.0) was superior to the fonnulations with lysine with respect to minimizing the formation of aggregates. Tab. 8: Formation of PSMA-BiTEl aggregates following agitation stress; all samples contain 0.2 mg/ml PSMA-BiTE1 molecules and 0.02% (mass/volume) polysorbate 80 pH Visually Content DLS [%] D50% [nm] Na 2

HPO

4 6.0 OK 103.2 9 6.5 OK 78.6 2451* 7.0 OK 52.9 1114* 7.5 OK 66.5 8 Lysine 6.5 OK 68.5 2945* Na 2

HPO

4 -lysine- 6.5 11 119.5 histidine OK -39 NaHPO 4 TRIS** 6.0 OK 99.0 6 *Aggregates ** Monomers 99.6%; diners 0.4% Example 9: Dependence of PSMA-BiTE1 aggregation on concentration In standard buffer systems, the proportion of dimers and multimers increased with the 5 concentration of PSMA-BiTEl molecules. However, dimers and multimers are acceptable to only a limited extent in formulations for therapeutic use, since they can influence the effectiveness of the formulation and of the therapeutic protein and provoke undesired immunological effects. Typically, the dimers are limited to a value of max. 5% and attempts are made to keep below said value as far as possible. Multimers and low-molecular-weight (LMW) fragments ought to be minimized as 10 well, or not present at all. The monomer/dimer ratio, as well as the proportion of multimers and low-molecular-weight fragments, is measured using size-exclusion chromatography (SEC). Using the buffer system comprising 50 mM Na 2

HPO

4 and 100 mM TRIS at pH 6.0, it was possible to sufficiently reduce the formation of dimers and multimers amongst the PSMA-BiTE1 molecules during concentration. 15 This buffer system made it possible to produce a stable BiTE formulation having a content of >2 mg/nl (table 9). Tab. 9: PSMA-BiTEI molecules in 50 mM Na2HPO 4 and 100 mM TRIS at pH 6.0 Protein content [mg/ml] 0.321 0.333 0.530 0.883 1.308 1.330 2.138 3.228 Monomers [%] 98.17 98.30 97.89 95.15 98.33 95.95 96.28 96.97 Dimers [%] 0.58 0.42 1.18 1.71 1.14 1.92 2.26 2.03 Multimers [%] < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 LMW [%] 1.24 1.28 0.93 3.14 0.53 2.14 1.45 1.00 LMW = low-molecular-weight fragments 20 -40 Example 10: Influence of trehalose and polysorbate on PSMA-BiTE1 stability The addition of trehalose and polysorbate does not lead to increased formation of dimers, multimers, or LMW fragments, as can be determined by means of SEC measurement. Example 10a: Influence of trehalose and polysorbate on PSMA-BiTE1 stability 5 The addition of trehalose dihydrate and polysorbate did not lead to increased formation of dimers, multimers, or LMW fragments (table 10). Tab. 10: PSMA-BiTEI molecules in 50 mM Na 2

HPO

4 and 100 mM TRIS at pH 6.0 with/without trehalose and polysorbate 80 Polysorbate 80 (% mass/volume) - 0.04% - 0.04% Trehalose dihydrate (% mass/volume) - - 4% 4% Protein content [mg/ml] 1.209 1,235 1.191 1.217 SEC Monomers [%J 98.3 98.3 98.5 98.2 Dimers [%] 1.6 1.7 1.5 1.7 Multimers [%J 0.1 0.1 < 0.05 0.1 LMW [%] <0.05 <0.05 <0.05 <0.05 10 Example 11: Storage stability of the PSMA-BiTE1 molecules The storage stability of the PSMA-BiTEI molecules can be detennined on the basis of the increase in the proportion of diners and/or multimers as a function of the storage time. The more rapid the increase in the proportion of these aggregates, the lower the storage stability. 15 It can be shown experimentally that the PSMA-BiTEI molecules in a concentration of 90 gg/ml, 500 gg/ml and 2 mg/ml are stable for a period of 9 days with respect to formation of dimers and/or multimers. The formulations are kept in injection syringes at about 2-8 0 C, following an initial phase of from 4 to 16 hours at room temperature (about 20'C). The compositions contain, in addition to the PSMA-BiTE1 molecules, 50 mM Na 2

HPO

4 , 100 mM TRIS, 0.04% polysorbate 80 20 and 4% trehalose. The proportion of PSMA-BiTEI monomers is measured using SEC-HPLC and compared with the proportion of PSMA-BiTE1 monomers at the start of the experiments (i.e. on day 0).

-41 Example Ila: Storage stability of the PSMA-BiTE1 molecules The storage stability of the PSMA-BiTEI molecules can be determined on the basis of the increase in the proportion of dimers and/or multimers as a function of the storage time. The more rapid the increase in the proportion of these aggregates, the lower the storage stability. 5 It was possible to show experimentally that the PSMA-BiTEl molecules in a concentration of 90 pg/ml, 500 gg/ml and 2 mg/ml were stable for a period of 9 days with respect to formation of diners and/or multimers (table 11). The formulations were kept in injection syringes at about 2 8*C, following an initial phase of from 4 to 16 hours at room temperature (about 20'C). The compositions contained, in addition to the PSMA-BiTE1 molecules, 50 mM Nva 2 HP04, 100 mM 10 TRIS, 0.04% polysorbate 80 and 4% trehalose dihydrate. The proportion of PSMA-BiTE1 monomers was measured using SEC-HPLC and compared with the proportion of PSMA-BiTEI monomers at the start of the experiments (i.e. on day 0). After 9 days in the case of compositions having a PSMA-BiTE1 starting concentration of 90 pg/ml and 500 pg/ml, this relative purity was 100%, i.e. the proportion of the monomers had not lowered over this time. In the case of the 15 compositions having 2 mg/ml PSMA-BiTE1 molecules, the relative purity was 97% after 9 days, absolutely corresponding to a decrease in the monomers by about 3% (from 97.58% on day 0 to 94.81% on day 9).

-42 Tab. 11: Determination of the purity (i.e. the proportion of monomers) of the PSMA-BiTE molecules by means of SEC-HTPLC over a period of 9 days Day PSMA-BiTEI Purity, proportion Relative purity (proportion of monomers) concentration of monomers [%] compared to TO value [pg/ml] Test 1 Test 2 Test 3 Mean Standard CV [%] Test 1 Test 2 Test 3 Mean deviation 0 90 98.30 98.21 98.20 98.24 0.06 0.1 - - - 2 98.35 98.39 98.37 98.37 0.02 0.0 100 100 100 100 7 98.59 98.53 98.40 98.51 0.10 0.1 100 100 100 100 9 98.37 98.36 98.39 98.37 0.02 0.0 100 100 100 100 Day PSMA-BiTE1 Purity, proportion Relative purity (proportion of concentration of monomers [%] monomers) compared to TO value [pg/ml] Test I Test 2 Test 3 Mean Standard CV [%j Test 1 Test 2 Test 3 Mean deviation 0 500 97.93 97.95 98.01 97.96 0.04 0.0 - 2 98.03 98.07 97.77 97.96 0.16 0.2 100 100 100 100 7 97.90 97.67 97.91 97.83 0.14 0.1 100 100 100 100 9 97.71 97.66 97.87 97.75 0.11 0.1 100 100 100 100 Day PSMA-BiTE1 Purity, proportion of monomers [%] Relative purity (proportion of concentration monomers) compared to TO value [ig/ml] Test 1 Test 2 Test 3 Mean Standard CV 1%] Test 1 Test 2 Test 3 Mean deviation 0 2000 97.45 97.54 97.75 97.58 0.15 0.2 - - 2 96.61 96.69 96.57 96.62 0.06 0.1 99 99 99 99 -43 7 94.79 95.34 95.04 95.06 0.28 0.3 97 98 97 97 9 94.71 94.88 94.84 94.81 0.09 0.1 97 97 97 97 In other experiments, in the liquid formulation having a PSMA-BiTE1 concentration of 2 mg/ml at 2-8 0 C over the course of a week, there was a moderate rise in the proportion of diners by 2.5% (from 3% to 5.5%), coupled with a stable proportion of multimers (table 12). At this concentration, 5 the PSMA-BiTE1 molecules are thus stable for a sufficiently long time to ensure container filling with virtually no losses and usage with virtually no losses. For long-term storage (i.e. storage for a period considerably longer than one week), PSMA-BiTE1 solutions can, however, be either frozen (-80*C) or lyophilized to ensure their stability. Lyophilization of the PSMA-BITEl-containing formulations was with preservation of bioactivity 10 was possible, as shown in example 17. Tab. 12: Storage stability of the BiTE formulation at 2-8 0 C (PSMA-BiTEJ concentration 2 mg/ml) Storage SEC SEC SEC time Monomers Dimers [%] Multimers [days] [%] [%J Start 96.4 3.0 0.6 0.25 96.2 3.2 0.6 0.5 96.0 3.4 0.6 0.75 95.9 3.6 0.5 1 95.8 3.7 0.5 3 95.7 4.0 0.4 7 94.2 5.5 0.4 15 93.7 6.1 0.2 -44 28 92.6 7.2 0.2 65 90.7 9.2 0.2 94 90.3 9.5 0.2 161 88.2 11.3 0.5 251 87.8 11.7 0.5 Example 12: Influence of pH on PSMA-BiTEI stability In principle, PSMA-BiTE molecules are stable in the selected formulation containing TRIS, phosphate (in this case: Na 2

HPO

4 ), trehalose and polysorbate within a pH range between pH 5.0 5 and 7.5. However, at a pH above pH 6, the proportion of dimers increases following shear stress. Example 12a: Influence of pH on PSMA-BiTE1 stability In principle, PSMA-BiTE1 molecules are stable in the selected formulation containing TRIS, phosphate (in this case: Na 2

HPO

4 ), trehalose dihydrate and polysorbate within a pH range between pH 5.0 and 7.5. However, at a pH above pH 6, the proportion of diners (>2%) increases following 10 shear stress (table 13). Tab. 13: 2 mg PSMA-BiTEJ molecules per ml in 50 mM Na 2

HPO

4 , 100 mM TRIS, pH [variable]; 4% (mass/volume) trehalose dihydrate, 0.04% (% mass/volume) polysorbate 80 pH 5.0 5.5 60 65 7.0 7.5 After production Protein content [mg/ml] 2.01 2.02 2.11 1.90 2.13 2.20 DLS (D50%) [nm] 10 11 15 11 12 10 SEC Monomers [%] 98.62 97.88 98.48 97.74 98.58 98.53 Dimers [%] 1.22 1.81 1.36 1.96 1.42 1.47 Multimers [%] < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 LMW [%] 0.15 0.31 0.16 0.30 < 0.05 < 0.05 After shear stress Protein content [mg/ml] 2.00 2.01 2.11 1.90 2.13 2.20 Protein content [%] 99.5 99.6 99.8 100.1 99.9 100.1 DLS (D50%) [nm] 10 15 12 10 - SEC Monomers [%] 98.37 98.21 98.23 97.83 97.42 97.53 Dimers [%] 1.63 1.79 1.77 2.17 2.58 2.47 Multimers [%] < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 LMW [%J <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 -45 Example 13: Influence of TRIS and phosphate on PSMA-BiTE1 stability Investigations with respect to different buffer strengths in the fonrmulation showed that the buffer strengths in the formulation can be varied: from 20 to 100 mM Na 2 HP0 4 and from 50 to 200 mM TRIS at pH 6.0 are useful with respect to minimizing the formation of PSMA-BiTE1 diners. All 5 combinations allow concentration and the action of shear stress. In the absence of TRIS, it was not possible to concentrate the PSMA-BiTE1 molecules, and in the absence of Na 2 HP0 4 , the proportion of dimers rose to over >2% following the action of shear stress. Also, the phosphate buffer exhibited good buffering action at pH 6.0 and supports the thermal stability of the PSMA-BiTEI molecules. 10 Tab. 14: 2 mg/mi PSMA-BiTE1 molecules in [variable] Na 2

HPO

4 , [variable] TRIS, pH 6.0, 4% (mass/volume) trehalose dihydrate, 0.04% (mass/volutme) polysorbate 80 Na 2

HPO

4 [mM] -_ 20 50 50 50 100 TRIS [mM] 100 100 100 50 200 100 After production Protein content [mg/ml] 2.23 2.08 2.11 2.19 2.17 2.07 DLS (D50%) [nm] 11 9 15 12 15 12 SEC Monomers [%] 98.11 98.78 98.48 99.22 99.01 99.19 Dimers [%] 1.57 1.22 1.36 0.78 0.99 0.81 Multimers [%] < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 LMW [%] 0.31 <0.05 0.16 <0.05 <0.05 0.30 After shear stress Protein content [mg/ml] 2.22 2.08 2.11 2.20 2.16 2.08 Protein content [%] 99.9 100.0 99.8 100.4 99.9 100.1 DLS (D50%) [nm] - - 12 13 13 12 SEC Monomers [%] 97.90 98.26 98.23 98.55 98.32 98.60 Dimers [%] 2.10 1.73 1.77 1.45 1.68 1.40 Multimers [%] <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 LMW [%] <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 Example 14: Influence of various wetting agents on PSMA-BiTE1 stability Various polysorbates can stabilize the PSMA-BiTE1 molecules in the formulation against shear 15 stress. However, the best results were achieved with polysorbate 80. Other stabilizers such as, for example, Synperonic F68 likewise had positive effects. From 0.04% to 0.10% (iass/vohune) polysorbate 80 had a good stabilizing effect on the PSMA BiTE1 molecules during the shear stress. 0.004% (mass/volume) polysorbate was not sufficient here to prevent an unacceptable increase in the formation of dimers following the action of shear 20 stress.

-46 Tab. 15: 2 mg/i PSMA-BiTEl molecules in 50 mM Na 2

HPO

4 , 100 mM TRIS, pH 6.0, 4% (mass/volume) trehalose dihydrate, [variable] wetting agent Wetting agent Polysorbate Polysorbate Synperonic Polysorbate Polysorbate 80 20 F68 80 80 Wetting agent [%(mass/vohume)] 0.04 0.04 0.04 0.004 0.10 After production Protein content [mg/ml] 2.11 2.13 2.10 2.13 2.08 DLS (D50%) [nm] 15 12 10 13 14 SEC Monomers [%] 98.48 97.92 98.59 98.47 98.36 Dimers [%] 1.36 2.08 1.24 1.36 1.46 Multimers [%] < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 LMW [%] 0.16 <0.05 0.16 0.17 0.17 After shear stress Protein content [mg/ml] 2.11 2.11 2.10 1.98 2.07 Protein content [%] 99.8 99.2 99.9 93.3 99.5 DLS (D50%) [nm] 12 14 10 3139 15 SEC Monomers [%] 98.23 96.54 - 92,54 98.09 Dimers [%] 1.77 3.46 - 7.46 1.91 Multimers %J < 0.05 < 0.05 - < 0.05 < 0.05 LMW [%] < 0.05 < 0.05 - < 0.05 < 0.05 Example 15: Influence of the PSMA-BiTEI concentration on the stability of the formulation 5 Using the formulation 50 mM Na 2

HPO

4 , 100 mM TRIS, pH 6.0, 4% (mass/volune) trehalose, 0.04% ('mass/volume) polysorbate 80, it is possible to produce PSMA-BiTEI concentrations up to 2 mg/ml. At higher PSMA-BiTE1 concentrations, the proportion of dimers distinctly increases. However, unacceptable values are measured only at PSMA-BiTE concentrations of greater than 4 mg/ml and after the action of shear forces (9.25% dimers at a PSMA-BiTE concentration of about 10 11.2 mg/ml). Example 15a: Influence of the PSMA-BiTE1 concentration on the stability of the formulation Using the fonnulation 50 mM Na 2

HPO

4 , 100 mM TRIS, pH 6.0, 4% (mass/volume) trehalose dihydrate, 0.04% (mass/volume) polysorbate 80, it was possible to produce PSMA-BiTEi 15 concentrations up to 2 mg/ml. At higher PSMA-BiTE1 concentrations, the proportion of dimers distinctly increased. However, unacceptable values were measured only at PSMA-BiTE concentrations of greater than 4 mg/ml and after the action of shear forces (9.25% dimers at a PSMA-BiTE concentration of about 11.2 mg/ml).

- 47 Tab. 16: [Variable] mg/mi PSMA-BiTEI molecules in 50 mM Na 2

HPO

4 , 100 mM ThIS, pH 6.0, 4% (mass/volume) trehalose dihydrate, 0.04% (mass/volume) polysorbate 80 PSMA-BiTE] cone. 0.4 2 4 11 [mg/mi] V____ After production Protein content [mg/ml] 0.44 2.11 4.42 11.17 DLS (D50%) [nn] 12 15 17 18 SEC Monomers [%J 98.67 98.48 96.62 95.63 Dimers [%] 1.16 1.36 2.82 3.73 Multimers [%] < 0.05 < 0.05 < 0.05 < 0.05 LMW [%] 0.16 0.16 0.56 0.63 After shear stress Protein content [mg/ml] 0.44 2.11 4.39 11.32 Protein content [%] 99.8 99.8 99.2 101.3 DLS (D50%) [mn] 10 12 12 16 SEC Monomers [%] 99.53 98.23 96.32 90.75 Dimers [%] 0.47 1.77 3.68 9.25 Multimers [%] < 0.05 < 0.05 < 0.05 < 0.05 LMW [%] <0.05 <0.05 <0.05 <0.05 Example 16: Lyophilization 5 After finishing the PSMA-BiTEl composition, it was lyophilized. Numerous freeze-drying units are available for this purpose, for example the Genesis Super XL from SP Scientific. Freeze-drying is achieved by the freezing of a substance and the subsequent sublimation of the ice without passing through a liquid phase. Tab. 17: Program for freeze-dying PSMA-BiTE formulations (total time: 42 h). Ts [*C] t [min) Vacuum [pbar] Ramp/hold Freezing phase 1 Room temperature 0 - Hold 2 -45 30 - Ramp 3 -45 240 - Hold Primary drying 1 -20 60 100 Ramp 2 -20 1000 100 Hold Secondary drying 1 25 60 10 Ramp 2 25 1140 10 Hold 10 "Ramp" = continuous temperature increase or decrease -48 In the freezing phase, the product was cooled down in a "ramp", i.e. continuously, within 30 min from room temperature to -45 C. To completely freeze the product solution, this temperature was held for 240 min. This was followed by the primary drying phase. At a chamber vacuum of 100 gbar, the 5 composition was heated within 60 min to -20*C. This temperature is held for 1000 min; the primary drying was then completed. For the subsequent secondary drying, the composition was heated in a vacuum of 10 gbar to 254C. These conditions were held for 1140 min in order to remove the residual water down to 5 2% (detection by means of Karl Fischer titration). At the end of the drying process, the unit was vented and the lyophilization vessels sealed. 10 Example 17a: Bioactivity of PSMA-BiTE1 lyophilisates after long-term storage and reconstitution Compositions containing PSMA-BiTEl molecules (table 18a) were stored as lyophilisate for up to 12 months at 2-8*C and at 25*C/60% relative humidity. After 3 and 12 months, solution was 15 reconstituted from lyophilisate in each case and analysed in a cell-based activity assay. The measurements (by means of the CytoTox-Glo Cytotoxicity Assay from Promnega) revealed unchanged bioactivity, after both 6- and 12-month storage under the aforementioned conditions. Furthermore, the storage stability of the reconstituted PSMA-BiTE1 solution was analysed. After reconstitution, the solution was first stored for 7 days in a refrigerator (2-8 0 C) and then for 16 20 hours at room temperature (+20 5*C). Subsequently, the bioactivity of the PSMA-BiTEI molecules was also ascertained here by means of a cell-based activity assay. It was 96% in reconstituted solution after the aforementioned further storage. The bioactivity of the PSMA-BiTE1 molecules in the lyophilized forulation was consequently stable after storage over 6-12 months under the aforementioned storage conditions. The same 25 applies to the solution reconstituted from this lyophilisate after storage for 7 days at 2-8*C and for 16 hours at room temperature. Example 17b: Stability of two representative batches - in terms of monomers (SEC and CGE), bioactivity (cell-based activity assay) and particles (HIAC and MFI) - of PSMA 30 BiTE1 lyophilisates after long-term storage and reconstitution - 49 Compositions containing PSMA-BiTEl molecules (table 18a) were stored as lyophilisate for up to 12 months at 2-8*C and at 25 0 C/60% relative humidity. After 3 and 12 months, solution was reconstituted from lyophilisate in each case and analysed in, inter alia, a cell-based activity assay. The measurements (by means of the CytoTox-Glo Cytotoxicity Assay from Promega) revealed 5 unchanged activities, and also only slight changes in the proportion of monomers in SEC and CGE, after both 3- and 12-month storage under the aforementioned conditions (table 18b). In addition, protein particles ranging in size from >2 to > 25 Jim were measured by means of micro-flow imaging (MFI) and HIAC (table c). The values remained stable within the limits of measurement accuracy for both batches during the storage time. 10 Table 18a: Composition of the freeze-dried product. Each colourless injection glass vial contains a Iyophilisate in the following composition: Composition Function Amount in mg" Amount in per cent of the solution before freeze drying Active ingredient PSMA-BITE1 Active ingredient 2.60 0.2 Excipients Na 2

HPO

4 *2H 2 0 Buffer 11.57 0.89 substance TRIS Buffer 15.73 1.21 substance Trehalose Cryoprotectant 52.00 4 dihydrate Polysorbate 80 Surfactant 0.52 0.04 10% HCI pH adjustment qs qs " The amounts include 0.3 ml overfill The lyophilisate is to be reconstituted with 1.2 ml water for injection. The solution for 15 administration then obtained has a concentration of 2 mg/ml. A vial contains, as a result of the overfill, 1.3 ml with 2.6 mg PSMA-BITEL.

- 50 Table 18b Stabilities of two batches of the formulation according to the invention of PSMA BITE1 Batch 1 SEC (monomers) CGE (reduced) CGE (not reduced) Bioactivity Sta rt 97.3% n.d. n.d. 101% 3 months, 6*C n.d. n.d. n.d. n.d. 3 months, 25"C/60 n.d. n.d. n.d. n.d. 12 months, 6*C 96.9% 99.54% 122.3% 12 months, 25 0 C/60 95.8% 99.51% 100% 100% Batch 2 SEC (monomers) CGE (reduced) CGE (not reduced) Bioactivity Start 98.0% 92.8% 3 months, 6"C 97.8% 136% 3 months, 25*C/60 97.7% 131.2% 12 months, 6*C 97% 100 100 123.5% 12 months, 25*C/60 96.71% 100 100 112.7% 5 Table 18c: Stabilities of two batches of the formulation according to the invention of PSMA BITE1 (protein particles) Batch 1 HIlAC MF -51 25pm 10pm 5pm 2pm 25 m 10 m 5pm 2pm Start 0 3 24 552 4 61 823 7239 3 months, 6*C 0 3 30 613 6 82 490 6697 3 months, 25*C/60 0 9 45 614 1 18 257 4663 12 months, 6*C 1 3 22 365 4 27 251 4788 12 months, 25 0 C/60 2 113 540 2296 18 317 1109 7557 Batch 2 HIAC MFI 25pm 10pm 5pm 2pm 25pm 10pm 5pm 2pm Start 0 3 40 808 2 39 404 6248 3 months, 6C 0 2 22 483 3 23 287 5723 3 months, 25*C/60 0 2 25 565 2 19 346 6247 12 months, 6*C 1 4 94 777 2 11 148 3957 12 months, 25*C/60 0 3 56 769 2 8 253 6469 Furthennore, the storage stability of the reconstituted PSMA-BiTE1 solution was analysed. After reconstitution, the solution was first stored for 7 days in a refrigerator (2-8*C) and then for 16 5 hours at room temperature (+20 ± 5C). Subsequently, the bioactivity of the PSMA-BiTEl molecules was also ascertained here by means of a cell-based activity assay. It was 96% in reconstituted solution after the aforementioned further storage. After storage over 3 to 12 months under the aforementioned storage conditions, the bioactivity of the PSMA-BiTE1 molecules in the lyophilized fonnulation was consequently stable within the 10 limits of measurement accuracy in each case. The other measurement parameters (SEC, bioactivity, MFI and HIAC data) also show this result. The same applies to the solution reconstituted from this lyophilisate after storage for 7 days at 2-8"C and for 16 hours at room temperature.

- 52 Example 18: Influence of shear stress in administration by means of injection syringe and cannula on the formation of PSMA-BiTE1 dimers Composition: 2.17 mg/ml PSMA-BiTE1 molecules, 50 mM Na 2

HPO

4 , 100 mM TRIS, pH 6.0, 4% 5 trehalose, 0.04% polysorbate 80 Material: Disposable syringes (BD 2 ml), cannulae (BD Microlance 30G1/2 (REF: 304000)) and brown-glass vials (6R) and CryoTubes. Procedure: 10 30 vials are thawed. 6 vials are used as starting values. For each experiment, 6 vials are used, i.e. withdrawn using the syringe/cannula and all injected into a brown glass or CryoTube. Experiments: 1. Slow injection of the PSMA-BiTE1 composition into a CryoTube (SyS Cryo) 2. Slow injection of the PSMA-BiTE1 composition into a brown glass (SyS Glass) 15 3. Rapid injection of the PSMA-BiTE1 composition into a CryoTube (SyS Cryo) 4. Rapid injection of the PSMA-BiTE1 composition into a brown glass (SyS Glass) Subsequently, the formation of dimers is measured by means of differential scanning fluorimetry (DSF). 20 Example 18a: Influence of shear stress in administration by means of injection syringe and cannula on the formation of PSMA-BiTE1 dimers Composition: 2.17 mg/ml PSMA-BiTEI molecules, 50 mM Na 2

HPO

4 , 100 mM TRIS, pH 6.0, 4% trehalose dihydrate, 0.04% polysorbate 80 Material: Disposable syringes (BD 2 ml), camulae (BD Microlance 30G1/2 (REF: 304000)) and 25 brown-glass vials (6R) and CryoTubes.

- 53 Procedure: 30 vials were thawed. 6 vials were used as starting values. For each experiment, 6 vials were used, i.e. withdrawn using the syringe/cannula and all injected into a brown glass or CryoTube. Experiments: 5 1. Slow injection of the PSMA-BiTE1 composition into a CryoTube (SyS Cryo) 2. Slow injection of the PSMA-BiTE1 composition into a brown glass (SyS Glass) 3. Rapid injection of the PSMA-BiTE1 composition into a CryoTube (SyS Cryo) 4. Rapid injection of the PSMA-BiTEl composition into a brown glass (SyS Glass) 10 Tab. 19: Formation of PSMA-BiTE1 dimers following action of shear stress owing to injection Start SyS Cryo SyS Glass SyR Cryo SyR Glass PSMA-BiTEl 2.17 2.21 2.16 2.19 2.16 SEC Monomers [%] 96.6 96.5 96.4 96.4 96.4 SEC Dimers [%] 3.3 3.4 3.5 3.4 3.4 SEC Multimers[%] 0.1 0.1 0.1 0.1 0.1 The formation of diners was measured by means of differential scanning fluorimetry (DSF). It was not possible to report a significant rise in the proportion of dimers after the injection of the composition by means of injection syringes and cannulae. This result shows that the fonnulation 15 according to the invention is, in all cases, stable with respect to the action of generated shear forces. Example 19: Stability of the PSMA-BiTEl solution after reconstitution (up to 28 hours at 2 8C) and at 2 dilutions and 2 temperatures (25*C) in 0.9* saline solution for up to 8 hours. The proportion of monomers, dimers and multimers was measured by means of SEC 20 chromatography. Composition: 2.0 mg/mil PSMA-BiTEI molecules, 50 mM Na 2

HPO

4 , 100 mM TRIS, pH 6.0, 4% trehalose dihydrate, 0.04% polysorbate 80 Material: 0.9% NaCl and water for injection -54 Procedure: 16 lyophilized PSMA-BiTE1 vials were reconstituted by adding 1.1 ml water for injection (WFI). Of these vials, 8 vials were stored at 2-8 0 C, 4 vials were diluted with 0.9% NaCl solution to the concentration of 0.066 mg/ml, and 4 vials were diluted with 0.9% NaC1 solution to the concentration of 0.66 mg/ml. They were incubated at 254C and examined at the times of 0 h, 2 5 h, 4 h and 8 h by means of SEC. Table 20: PSMA-BiTE1 stability in the case of dilution in 0.9% NaCI solution and incubation at 25"C for up to 8 hours, and also up to 28 hours at 2-84C in the case of the reconstituted solution. Sample description SEC [hi Multimers Dimers Monomers 2 mg/ml reconst. lyo, Start, RT 0 0.3 2.0 97.7 2 mg/ml reconst. lyo, 1 h, 2-8*C 1 0.2 2.1 97.7 2 mg/ml reconst. lyo, 2 h, 2-8 0 C 2 0.2 2.1 97.7 2 mg/mi reconst. lyo, 4 h, 2-84C 4 0.2 2.2 97.6 2 mg/mI reconst. lyo, 8 h, 2-8*C 8 0.3 2.3 97.5 2 mg/ml reconst. lyo, 12 h, 2-8*C 12 0.3 2.4 97.3 2 mg/ml reconst. lyo, 18 h, 2-8 0 C 18 0.2 2.5 97.2 2 mg/ml reconst. lyo, 28 h, 2-84C 28 0.3 2.8 97.0 0.0666 mg/ml diluted in 0.9% NaCl, Start, RT 0 0.1 1.9 98.0 0.0666 mg/ml diluted in 0.9% NaCl, 1 h, RT 1 0.1 1.5 98.4 0.0666 mg/mI diluted in 0.9% NaCl, 4 h, RT 4 < 0.05 1.2 98.7 0.0666 mg/ml diluted in 0.9% NaCl, 8 h, RT 8 < 0.05 1.1 98.8 0.666 mg/ml diluted in 0.9% NaCl, Start, RT 0 0.2 2.2 97.6 0.666 mg/nl diluted in 0.9% NaCl, I h, RT 1 0.2 2.2 97.6 0.666 mg/ml diluted in 0.9% NaCl, 4 h, RT 4 0.3 2.2 97.5 0.666 mg/ml diluted in 0.9% NaCl, 8 h, RT 8 0.3 2.2 97.5 As expected, the samples reconstituted using WFI show again the increase in dimers which can be expected for a 2 mg/ml solution at 2-84C. The decrease in monomers clearly correlates with the 10 increase in dimers, and no multimers are formed. The dilutions in 0.9% NaCl solution show a result comparable to the results in PBS. In the case of 0.666 mg/mI, the monomer/dimer ratio remains constant, and in the case of 0.066 mg/ml, there is in turn an increase in monomers. 15 Example 20: Model experiment on the stability of the PSMA-BITE1 solution in the case of subcutaneous administration.

- 55 To this end, the reconstituted PSMA-BiTE1 solution was examined in PBS at 2 dilutions and 2 temperatures (25*C & 37*C). Measurements were made of the proportion of monomers, dimers and multimers, and of fragments (LMW), by means of SEC chromatography, and also of sub-visible particles (SVP) by means of MFI. 5 Composition: 2.0 mg/ml PSMA-BiTEl molecules, 50 mM Na 2

HPO

4 , 100 mM TRIS, pH 6.0, 4% trehalose dihydrate, 0.04% polysorbate 80 Material: PBS Procedure: To determine the stability of the diluted PSMA-BITE-l solutions under sc administration conditions, eight lyophilized PSMA-BiTEl vials were each reconstituted by adding 10 1.1 ml WFI. Using PBS, 4 vials were diluted to the concentration of 0.066 mg/ml and 4 vials were diluted to the concentration of 0.66 mg/mi. They were incubated at 25*C (control) and 37 0 C and measured at the times of 0 h, 2 h, 4 h and 8 h by means of SEC and MFL. Table 20.1: PSMA-BiTEl stability in the case of dilution in PBS and incubation at 25*C (top) and 15 37 0 C (bottom) for up to 8 hours Dilution with PBS at 25 0 C Sample Dilution in Times SEC [%] MFI PBS (particles/container) C [mg/ml] [h] Multimers Dimers Monomers LMW >2 pm > 5pm 210 >25 mwn pm 1 0.0666 0 0.05 1.92 98.03 na 2 0.0666 2 0.04 1.86 98.10 na 3 0.0666 4 0.05 1.85 98.10 na 4 0.0666 8 0.03 1.79 98.19 na 3336 2582 908 210 5 0.666 0 0.08 1.93 97.94 0.05 6 0.666 2 0.07 1.95 97.93 0.06 7 0.666 4 0.06 1.96 97.92 0.06 8 0.666 8 0.05 1.99 97.90 0.06 5729 876 246 39 9 Only PBS 0 - - - - 1410 534 168 30 Dilution with PBS at 37 0 C Sample Dilution in Times SEC [%J MI PBS (particles/container) C [mg/ml] Multimers Dimers Monomers LMW >2 pin 5 pm 210 225 __ _ pm m 1 0.0666 0 0.05 1.95 98.00 na 2 0.0666 2 0.02 1.58 98.40 na 3 0.0666 4 na 1.30 98.70 na 4 0.0666 8 0.02 0.97 99.02 na 726 198 82 24 5 0.666 0 0.10 1.96 97.88 0.06 6 0.666 2 0.05 1.92 97.97 0.06 -56 7 0.666 14 10.05 11.89 97.99 10.07 1 1 1 8 0.666 8 0.05 1.88 98.00 0.07 5731 928 294 42 The dilution with PBS and incubation in PBS at 370C shows that the PSMA-BiTE1 molecule is stable under these simulated conditions of subcutaneous administration. In the case of 0.66 mg/ml, we have a stable monomer/dimer ratio for both incubation temperatures. By contrast, in the case of 5 0.066 mg/ml, we see the effect that the proportion of dimers decreases and the proportion of monomers increases. This is an effect of reversible dimer formation, which is concentration- and time-dependent. In the case of the SVPs, there is a tendency towards a slight concentration-, temperature- and time-dependent formation of SVPs, which, however, does not represent a stability problem. This shows the suitability of the fonnulation for subcutaneous administration. 10 Example 21: Stability of the PSMA-BiTE1 dilutions in 0.9% NaCl solutions for dose-range finding studies. PSMA-BiTE1 lyophilisates were reconstituted with 1.2 ml WFI and admixed with 0.9% strength NaCl solution which was adjusted to a polysorbate 80 content of 0.004%. This was necessary in 15 order to avoid losses in the bioactivity of the highly diluted solutions. To this end, a 1% strength polysorbate 80 solution in a 50 mM sodium phosphate buffer (pH 6.5) was produced. This solution was added to a commercially available 0.9% strength NaCl solution (e.g. Baxter Viaflo 250 ml) to achieve a final concentration of 0.004%. Using this solution, dilutions of PSMA-BiTE1 ranging from 0.05 gg/ml to 2000 gg/ml were produced in the following steps: 20 - 0.05 pg/ml - 0.7 gg/ml - 2 pg/ml - 18 g/ml - 90 gg/ml 25 - 500 mg/ml - 2000 gg/ml To this end, use was made of sterile, empty infusion bags (e.g. 150 ml bags from Impromediforn GmbH, REF MF 1661)), into which the conditioned saline solution was initially charged. Corresponding amounts of reconstituted PSMA-BiTEl solution were added to this solution and 30 mixed by rotating the bag. 1 ml aliquots were filled into 2 ml syringes (e.g. Injekt 2 ml/Luer Lock Solo Braun (REF 46067001V)) and sealed with Conibi stoppers from B. Braun (REF 4495101).

- 57 These syringes were then stored in a refrigerator at from 2 to 8C for up to 9 days. This storage included storage at RT (20 0 C +/- 5 0 C) for 4 or 20 hours. For the measurement, an injection needle (BD Microlance 3 30G1/2" 0.3*13 mm) for subcutaneous administration was attached to the syringe (REF 304000) and the solution was expelled therethrough into a 2 ml vial (glass type 1). 5 The bioactivity of the diluted solutions was examined in a cytotoxicity assay. The recovery (protein content) was ascertained in an (electrochemiluminescent assay) ECL assay. Owing to a limited measurement range in the ECL assay, it was necessary to dilute the assay solutions in the conditioned 0.9% strength saline solution prior to the analysis, as follows: - 0.05 gg/ml: undiluted 10 - 0.7 pg{ml: I : 50 - 2 pg/ml: 1:200 - 18 g/ml: 1:1000 Tables 21 a and b show the results of the storage studies of the final injection solutions ranging 15 from 0.05 to 18 gg/ml PSMA-BiTEI over a storage time of 9 days. The protein concentration remains stable for all final concentrations. The relative concentrations (compared to the TO values) are within the range from 79% to 117%. On the basis of previous experiences with this substance class, an acceptance criterion of from ±40% to -50% difference in relation to the TO value was ascertained. The measured data lie well within this acceptance range. 20 - 58 Table 21 a: Determination of the protein content by ECL assay within the range from 0.05 pg/ml to 18 pg/mIl Nominal Concentration [pg/ml] Day ] Al A 2 A 3 A 4 Ave STDEV CV Recovery Rel. diff. to TO value 0 0.049 0.058 0.044 0.044 0.049 0.01 13 98 2 0.045 0.048 0.054 0.053 0.05 0 9 100 2 0.05 7 0.041 0.047 0.049 0.045 0.046 0 8 91 -7 9 0.037 0.042 0.041 0.035 0.039 0 8 77 -21 Nominal Concentration [pg/ml] Day - - - Recovery Rel, duff, to TO value [pg/mi} A 1 A 2 A 3 A 4 Ave STDEV CV [%] [Re [.o] 0 0.63 0.55 0.62 0.58 0.6 0.04 6 85 2 0.43 0.63 0.81 0.81 0.67 0.18 27 96 12 - - 0.7 7 0.51 0.52 0.49 0.65 0.54 0.07 13 77 -9 9 0.67 - 0.53 0.5 0.57 0.09 17 81 -5 Nominal Concentration [pg/ml] Day BiTE Recovery Rel. duff, to TO value [pg/ml] A l A 2 A 3 A 4 Ave STDEV CV [%] [e%] [%] 0 2.46 1.3 2.04 1.99 1.95 0.48 25 97 2 1.32 1.62 2.21 2.17 1.83 0.44 24 91 -6 2 7 1.14 1.74 1.46 2.02 1.59 0.38 24 79 -18 9 2.62 2.02 1.75 1.85 2.06 0.39 19 103 6 Nominal Concentration [pg/mIl] Day BiTE ________ [pg/ml] A 1 A 2 A 3 A 4 Ave STDEV CV [%] Recovery Rel. diff. to TO value 0 11.37 9.44 11.74 9.6 10.54 1.19 11 59 2 11.11 - 12.12 13.61 12.28 1.26 10 68 17 18 7 6.75 9.77 12.92 10.85 10.07 2.58 26 56 -4 9 8.23 10.5 10.57 11.02 10.08 1.25 12 56 -4 5 - 59 Table 21b: Determination of the relative concentration by ECL assay within the range from 0.05 pg/ml to 18 gg/ml Nominal BiTE Relative conc. compared to the TO value [%] Day [pg/ml] A 1 A 2 A 3. A 4 Average 0 - - - - 2 91 98 111 109 102 0.05 7 84 96 101 92 93 9 75 85 83 72 79 Nominal BiTE Relative conc. compared to the TO value [%] Day [pg/mi] A I A 2 A 3 A 4 Average 0 - - 2 71 106 136 136 112 0.7 7 86 87 82 108 91 9 113 - 88 84 95 Nominal BiTE Relative conc. compared to the TO value [%] Day [pg/mi] A 1 A 2 A 3 A 4 Average 0 - - - - 2 68 83 113 112 94 2 7 58 89 75 104 82 9 135 104 90 95 106 Nominal BiTE Relative conc. compared to the TO value [%] Day [pg/mi] A 1 A 2 A 3 A 4 Average 0 - - - 2 105 - 115 129 117 ---- 18 7 64 93 123 103 96 9 78 100 100 105 96 5 Abbreviations used in tables 21a and b: BiTE: PSMA-BiTE I molecule A: Assay Ave: Average TO value: Value at time 0 10 For use in the CytoTox-Glo Cytotoxicity Assay, it was necessary to dilute the assay solutions with assay medium, as follows: 18 pg/ml: 1: 36 90 gg/ml 1 :180 15 500 gg/ml 1 :1000 2000 gg/ml 1 : 4000 - 60 The biological activity of the assay material is expressed as "relative bioactivity". It is determined as follows: Relative biological activity = EC50 (reference standard) 5 EC50 (assay control) Table 22 shows that the bioactivity of the final infusion solutions containing from 18 gg/ml to 2000 ptg/ml PSMA-BiTEI remains stable over a storage period of 9 days. The relative bioactivities vary during the 9 storage time of 9 days, compared to the TO value, within a range of 77% - 132%. These results thus lie well within a previously determined acceptance range of 50% to 200% 10 bioactivity. Table 22a: Determination of the relative potency by cell-based cytotoxicity assay within the range from 18 to 2000 pg/ml. Nominal BiTE Relative potency [pg/mIl A ] A 2 A 3 A 4 Ave STDEV CV [%] O 0.87 1.08 0.75 - 0.9 0.17 19 2 1.1 0.88 0.85 - 0.94 0.14 15 18 7 0.82 - - - 0.82 - 9 0.56 0,83 - - 0.7 0.19 27 Nominal BiTE Relative potency [pg/mi] A l A 2 A 3 A 4 Ave STDEV CV[%] 0 0.91 0.82 0.72 - 0.82 0,09 12 2 0.85 0.96 0.91 - 0.91 0.06 6 90 7 0.79 - - - 0.79 - 9 0,68 0.9 - - 0.79 0.16 20 Nominal BiTE Relative potency Day i[pg/mI] A I A 2 A 3 A 4 Ave STDEV CV [%] 0 0.81 0.92 0.93 0.89 0.89 0.05 6 2 1.35 1.18 0.99 - 1.17 0.18 15 500 7 0.94 1.09 - - 1.01 0.1 10 9 0.99 0.94 - - 0.96 0.03 3 Day Nominal BiTE Relative potency [pg/ml] A I A 2 A 3 A 4 Ave STDEV CV [%] 0 0.87 1.12 0.64 0.71 0.84 0.21 25 2 0.79 1,24 1.25 0.84 1.03 0.25 24 2000 7 0.74 0.91 - - 0.83 0.12 15 9 0.97 0.94 - - 0.96 0.02 2 -61 Table 22b: Determination of the relative bioactivity compared to the TO value by cell-based cytotoxicity assay within the range from 18 to 2000 ptg/ml. Nominal BiTE Relative bioactivity compared to the TO value [%] [g/ml] A l A 2 A 3 A 4 Ave 0 - - 2 123 97 94 105 18 7 92 - - - 92 9 63 92 - - 77 Nominal BiTE Relative bioactivity compared to the TO value [%] Day [pg/ml] A l A 2 A 3 A 4 Ave 0 - - - 2 104 118 112 - 111 90 7 97 - - - 97 9 83 110 - - 97 Nominal BiTE Relative bioactivity compared to the TO value [%] Day [pg/mI] A l A 2 A 3 A 4 Ave 0 - - - - 2 152 133 112 - 132 500 7 106 123 - - 114 9 111 107 - - 109 Nominal BiTE Relative bioactivity compared to the TO value [%J Day[gmi A l A 2 A 3 A 4 Ave 0 - - - - 2 95 148 149 100 123 2000 7 88 109 - - 99 9 116 113 - - 115 Abbreviations used in table 22: 5 BiTE: PSMA-BiTE 1 molecule A: Assay Ave: Average TO value: Value at time 0 10 The differences in the bioactivity of solutions diluted and stored for 9 days were not greater than ±33% compared to the TO values, There is no apparent trend indicating a distinct loss of bioactivity during the storage time. Assay solutions containing 18 gg/ml PSMA-BiTEI exhibit a slight decrease in bioactivity during the storage time, but it was not possible to confinn this trend when the assay solutions of the higher concentrations are considered. 15 In addition, in the ECL assay, the concentration of 18 gg/ml exhibited no decrease in protein concentration over the storage time.

- 62 In summary, it can be stated that the storage of the final injection solutions of PSMA-BiTEl within a concentration range of 18 - 2000 pg/ml, compatible with the dilution conditions used and with the storage and administration system, for up to 9 days at a temperature of +2-8 0 C, including a period of up to 20 hours at +2015'C, is possible. 5 Example 22: Bioavailability of PSMA-BiTE1 following subcutaneous administration Using the formulation of 50 mM Na 2

HPO

4 , 100 mM TRIS, pH 6.0, 4% trehalose, 0.04% polysorbate 80, it is possible to achieve high bioavailability following subcutaneous administration. The s.c. bioavailability of the PSMA-BiITE molecules is examined in 4 female Cynomolgus 10 monkeys. The dosage is 45 jig/kg for the s.c. administration and is compared to an i.v. administration of 5 and 15 jig/kg of body weight (BW). The 2 ing/ml stock solution is diluted with physiological saline solution. The infusion time of the i.v. administration is I hour and the infusion rate is 1 ml/kg BW. The selected site of injection is a superficial vein (V saphena parva). For the s.c. administration, the test solution is injected into the lateral chest region at 0.15 ml/kg BW. The 15 blood levels are examined using an ELISA assay. To this end, ECL technology is used. The lower limit of quantification (LLOQ) of the method is 4 pg/1. Example 22a: Bioavailability of PSMA-BiTE1 following subcutaneous administration Using the formulation of 50 mM Na2HPO 4 , 100 mM TRIS, pH 6.0, 4% trehalose dihydrate, 0.04% polysorbate 80, it is possible to achieve 66% bioavailability following subcutaneous administration. 20 The s.c. bioavailability of the PSMA-BiITEi molecules was examined in 4 female Cynomo/gus monkeys. The dosage was 45 gg/kg for the s.c. administration and was compared to an i.v. administration of 5 and 15 jig/kg of body weight (BW). The 2 mg/ml stock solution was diluted with physiological saline solution. The infusion time of the i.v. administration was 1 hour and the infusion rate was I ml/kg BW. The selected site of injection was a superficial vein (V saphena 25 parva). For the s.c. administration, the test solution was injected into the lateral chest region at 0.15 ml/kg BW. The blood levels were examined using an ELISA assay. To this end, ECL technology was used. The lower limit of quantification (LLOQ) of the method was 4 jig/l. Methods 30 Production of the PSMA-BiTE molecules Methods for producing BiTE molecules, more particularly PSMA-BiTE molecules, are described in W02010037836 A2 for example.

-63 Firstly, the PSMA-BiTE1 -encoding recombinant BiTE DNA construct was integrated into a suitable expression vector and stably introduced thereby into eukaryotic CHO (Chinese hamster ovary) cells. The transfected CHO cells were cultured in a bioreactor with a suitable culture medium and the secreted protein was isolated by filtration of the cells. The purification of the BiTE 5 molecules comprised replacing the buffer substances with TRIS and phosphate by means of size exclusion chromatography (SEC) and subsequent concentration by means of ultrafiltration and diafiltration. In addition, a polyol (preferably trehalose) and a wetting agent (preferably polysorbate 80) was added. The composition was stored at below -604C. Differential scanning fluorimetry (DSF) 10 The measurements on the stability of the PSMA-BiTEl molecules (e.g. following shear stress) were carried out using a 750 Fast Real-Time PCR System (Applied Biosystems). Different PSMA BiTEI concentrations (between 0.15 and 0.005 mg/ml) were admixed with a fluorescent dye (e.g. "Sypro@ Orange 5000") in 96-well plates (microtitre plates) and measured in a PCR system (750 Fast Real-Time PCR System, Applied Biosystems). The temperature was increased from 20*C to 15 90*C. The melting points of the proteins were ascertained via fluorescence detection, which comes about in a temperature-dependent manner when the fluorescent dye reacts with the hydrophobic regions of the protein. Differential scanning calorimetry (DSC) The thermal unfolding temperature (Tm) of the PSMA-BiTEl molecules was ascertained by means 20 of DSC. For this purpose, the samples were heated from 20'C to 105*C and the melting point of the polypeptides was ascertained using a calorimeter. A VP-DSC instrument from GE Healthcare was used. Agitation stress The samples were stressed by agitation on a laboratory shaker (IKA, HS 260) in a temperature 25 controlled chamber (MMM, FrioCell 200). The critical quality parameter of aggregation was ascertained after 24 hours at 300 rpm and 204C. Visual check The stability of PSMA-BITE solutions was visually checked after the shear stress by holding the solutions against a dark background and checking for visible particles or turbidity. A clear solution 30 following the agitation stress test indicates little or no formation of dimers and/or multimers, whereas visible turbidity of the solution correlates with a high proportion of diners and/or multimers.

- 64 Dynamic light scattering (DLS) Dynamic light scattering is a method for analysing the scattered light of a laser on a dissolved or suspended sample. What is measured is the hydrodynamic radius, which in turn makes it possible 5 to infer the aggregation state of the PSMA-BiTEl molecules. The hydrodynamic radius was measured using a Horiba LB 550 (Retsch Technology). Determination of the protein content The protein content was measured spectrometrically at 280 nm using a Nanodrop 2000 (Therno Scientific). All samples were measured against the corresponding placebo or buffer solutions. 10 Each sample solution was pipetted (2 ptl) 3x into the measurement area of the Nanodrop instrument and measured in duplicate in each case; thereafter, these measured values (n=6) were averaged. The protein content [mg/ml] was calculated from the averaged measured values via a previously created protein calibration function (dependence of absorption in relation to protein content). Electrochemiluminescent measurement (ECL assay) 15 For this method, use was made of SULFO-TAGm labels, which emit light following electrochemical stimulation. Stimulation was carried out on the surfaces of electrodes of so-called MULTI-ARRAY microplates. The emitted light was measured at approx. 620 nm using a detector. The measurement was based on the "sandwich" method, in which PSMA-BiTE1 molecules in solution have been immobilized on a microplate by means of polyclonal goat anti-PSMA-BiTE1 20 antibodies. Penta-His-biotin was then bound to the immobilized BiTE molecules and detected by means of SULFO-TAGT"-conjugated streptavidin. The samples were read out in a Sektor Imager 2400. Size-exclusion chromatography (SEC) To determine the proportions of monomers and diners and also the low-molecular-weight (LMW) 25 and high-molecular-weight (HMW) fractions, size-exclusion chromatography was carried out using an HPLC system. Measurement was carried out using a fluorescence detector and calculation was carried out by means of the area per cent method. The column used was a standard column for the SEC of proteins, for example a Tosoh Biosep TSK gel G3000 SWXL 5 gm, 300 mm, length x 7.8 mm i.D. or an equivalent material. 30 - 65 Determination of PSMA-BITE1 concentrations in serum following i.v. and s.c. administration The concentration of PSMA-BITE1 in the serum of Cynomolgus monkeys was measured by means of ELISA. Detection was carried out by means of electrochemiluminescence. The detection limit (LLOQ) was 0.98 sig/i, with a precision of from 3 to 28% and an accuracy of from 70 to 100%. 5 Cell-based activity assay The cell-based cytotoxicity assay is used as a routine assay for determining the relative activity of PSMA-BiTEI samples. Owing to the bispecific binding of PSMA-BiTEl to human/cynonolgus CD3-positive and human/cynomolgus PSMA-positive cells, T-cell-mediated lysis of the target cells takes places following activation of the T cells (effector cells). 10 Cytotoxicity is detected by means of the luminescent CytoTox-Glo Cytotoxicity Assay from Promega. The measured value used here is the amount of light signal released, which correlates with the number of dying cells. Further activity assays are described in W02010037836 A2. Cell-based cytotoxicity assay for determining the relative activity of the PSMA-BiTE1 samples Instruments and material 1. Laminar flow cabinet 2. Cell culture incubator 3. Microscope 4. Cell counter, for example haemocytometer 5. 96-well U-bottom plates, clear (e.g. Greiner Bio-one) 6. 96-well flat-bottom plates, white (e.g. Nunc, 3058078) 7. Cell culture flasks 8. Multi-plate measurement instrument Reagents 1. Effector cells, for example MC 15 2. Target cells, for example C4-2 3. 0.4% Trypan blue - 66 4. Penicillin-streptomycin 5. L-Glutamine (200 mM) 6. Interleukin 2 7. Medium - MC 15: Advanced RPMI 1640 8. Foetal calf serum (FCS), for example Gibco 10270106 9. PBS, for example Gibco 20012 10. Medium - C4-2: RPMI 1640 with L-glutamine, for example Gibco 11835063 11. Detection reagent, for example CytoTox Glo, Promega G9291 Growth media Medium for MC 15 cells, for example 900 ml of Advanced RPMI 1640 + 100 ml of FCS + 10 ml of penicillin-streptomycin + 10 ml of L-glutamine (200 mM) + 10 - 20 pl of [100-200 U/ml] interleukin 2 Medium for C4-2 cells, for example 900 ml of RPMI 1640 with L-glutamine + 100 ml of FCS + 10 ml of penicillin-streptomycin Assay medium Assay medium, for example 900 ml of RPMI 1640 with L-glutamine - 67 + 100 ml of FCS Start of MC15 cell culture Cells for the assay were kept in liquid nitrogen. The cells were thawed rapidly at 37*C. The cells were then re suspended in 15 ml of cold medium and incubated for 10 min. The cells were then centrifuged for, for example, 7 minutes at 700 g, the supernatant discarded, and the pellet re suspended in 10 ml of growth medium. Cells were incubated at 37*C and 5% CO 2 for approx. 3-4 days. Sub-culturing of MC15 Aliquots of live cells from the culture are counted. Centrifuge for 7 minutes at 170 g. Discard the supernatant and adjust the pellet with growth medium to a concentration of 0.5 x 106 to 1.5 x 106 cells/ml. The cells should be passaged 2-3 times per week. Start of C4-2 cell culture Cells for the assay are kept in liquid nitrogen. The cells are thawed rapidly at 37 0 C. The cells are then re-suspended in 20 ml of medium. Then centrifuge for, for example, 7 minutes at 700 g. Discard the supernatant and re-suspend the pellet in 10 ml of growth medium. Cells are incubated at 374C and 5% CO 2 for approx. 3-4 days. Sub-culturing of C4-2 Remove the medium from the flask and discard. Carefully rinse the cell layer with 10 ml of PBS, Add 2-3 ml of trypsin and incubate at 37*C until the cell layer detaches (approx. 5-15 min).

-68 Add 10 ml of medium and dissolve the cells. Centrifuge for, for example, 7 minutes at 170 g. Discard the supernatant and re-suspend the pellet in 10 ml of growth medium, count the cells, and adjust the cells with medium to a suitable density. Cells are incubated at 37 0 C and 5% CO 2 for approx. 3-5 days and should be passaged 1-2 times per week. Preparation of the cells for the Detach the cells as described above. assay Adjust the effector cells (MC15) in assay medium to a concentration of 2 x 10E6 cells/ml. Adjust the target cells (C4-2) in assay medium to a concentration of 4 x 1OS cells/ml. Mix equal volumes of target and effector cells 1:1 (cell mixture). Preparation of the samples, assay Equilibrate the sample(s), assay control and reference control and reference material material (RF) to room temperature, mix well, and adjust them all with assay medium to the same first concentration (VI; for example 500 ng/ml). Then carry out a serial dilution (for example 1:6, n = 7) using assay medium to obtain best fit dose-response curves. Test procedure Addition of the samples, assay Transfer aliquots of samples, assay control and reference control and reference material material (e.g. 25 gl) to the corresponding wells of a 96-well flat-bottom plate. Transfer the cell mixture (e.g. 50 gl) to each well of a 96- - 69 well flat-bottom plate. Agitate the plate for, for example, I min at 400 rpm. Incubate the plate for 16 - 24 h at 37*C and 5% Co 2 . Determining cytotoxicity and relative activity Addition of the detection reagent Dilution and addition of the reagent and also the subsequent and measurement measurement are carried out in accordance with the instructions from the manufacturer, for example CytoTox - Glo, Promega. Add 15 sl of reagent per well. Agitate the plate for, for example, 1 min at 400 rpm. Incubate at room temperature for approx. 15 min. The luminescence is measured using a suitable multi-plate measurement instrument. Evaluation Best-fit curve Determnine the mean measured values at each concentration for the replicates of the samples, assay control and reference material. Draw a dose-response curve for each series of samples, assay control and reference material. For this purpose, the mean measured values are plotted against the final concentrations of BAY2010112 (e.g. 500 000 pg/ml to 1.79 pg/ml). Fit a suitable best-fit curve through the mean measured values of the concentration levels of the samples, assay control and - 70 reference material, Relative activity (determination) The activity ratio between sample and reference material is determined and documented. Statistical software can be used. Assessment The relative activity of the sample compared to the reference material must correspond to the specification. Determination of the concentration of the PSMA-BiTE1 polypeptides (UV/VIS spectroscopy) The method is carried out according to the European Pharmacopoeia (Ph. Eur., 2.2.25, UV-VIS spectroscopy at 280 nm) and is also suitable for determining the concentration of other molecules. 5 Firstly, the extinction coefficient of the PSMA-BiTEl molecules was determined experimentally. To this end, the absorbance of solutions of known PSMA-BiTEI concentration was determined, the concentrations (in mol/I) being established on the basis of the molar mass of the PSMA-BiTE molecules (1.8673 x 105 g/mol). On the basis of the absorbance, the path length and the concentration, it was possible to calculate the extinction coefficient e of PSMA-BiTE1 molecules, 10 according to e = A / c x d, where A = absorbance (or absorption, disregarding light scattering) at a suitable wavelength (in this case, 280 mn) c = concentration (mol/l) 15 d = path length (mm). The absorbance values were then plotted on the y-axis against the associated concentrations on the x-axis to obtain a standard curve. Using these standard curves, it was subsequently possible to directly read off the concentration of PSMA-BiTE1 solution on the basis of the absorbance. To create the aforementioned standard curves, the Beer-Lambert law must be applicable to the 20 solution measured, i.e., inter alia, the absorbing substance must be homogeneously distributed in the solution, the variation of the absorption coefficients within the spectral range measured must be negligible, and the solution measured must be concentrated to a sufficiently low level so that interaction-related deviations do not occur.

-71 Using the extinction coefficient of a molecule, the protein concentration (in mol/l) can also be inversely calculated on the basis of the measured absorbance (or absorption at 280 nn), according to: Protein concentration [mol/l] = A x V / e x d, where 5 A = absorption at 280 nm d = cell length in cm (standard cell, 1.00 cm) V = dilution of the test solution e = extinction coefficient of PSMA-BiTEI at 280 nmr= 111 315 M' x cm'.

Claims

1. Liquid pharmaceutical composition comprising a polypeptide, TRIS and phosphate, the polypeptide comprising the amino acid sequence reproduced in SEQ ID NO: 8, characterized in 5 that the composition contains the polypeptide in a concentration of from 0.5 ug/ml to 3.0 mg/ml, that the composition contains 100 mM TRIS and 50 mM phosphate, that the pH of the composition is about 6.0 and that the composition contains 0.04% polysorbate 80. 10

2. Composition according to Claim 1, characterized in that the composition additionally contains a lyoprotectant.

3. Composition according to Claim 2, characterized in that the composition contains 2 - 10% of a lyoprotectant.

4. Composition according to either of Claims 2 and 3, characterized in that the lyoprotectant 15 is trehalose or trehalose dihydrate.

5. Composition according to Claim 1, characterized in that the composition additionally contains about 4% trehalose dihydrate.

6. Composition according to any of the preceding claims, characterized in that the composition contains the polypeptide in a concentration of 2 mg/ml. 20

7. Solids mixture obtainable by lyophilization of a liquid composition according to any of the preceding claims.

8. Liquid pharmaceutical composition, characterized in that the composition is reconstituted by dissolving a lyophilized solids mixture according to claim 6 in a suitable liquid medium.

9. Composition according to any of the preceding claims, characterized in that the 25 bioavailability of the polypeptide following subcutaneous administration of the composition is >60%.

10. Composition according to any of the preceding claims for use in a therapeutic method. -73

11. Composition according to any of the preceding claims for use in a therapeutic method, said method comprising parenteral administration of the composition.

12. Composition according to any of the preceding claims for use in a method for therapeutically treating hyper-proliferative diseases of the prostate. 5

13. Composition according to any of the preceding claims for use in a method for therapeutically treating hyper-proliferative diseases of the prostate, the method comprising subcutaneous administration of the composition.

14. Syringe containing a composition according to any of the preceding claims.